Khan Academy Class 10 Math Videos and Exercises (NCERT)

Math Videos:

Real numbers
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-numbers#x573d8ce20721c073:real-numbers

Intro to Euclid's division algorithm
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-numbers/x573d8ce20721c073:euclid-s-division-algorithm/v/intro-to-euclids-division-algorithm-real-numbers

Euclid's division algorithm visualised
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-numbers/x573d8ce20721c073:euclid-s-division-algorithm/v/euclids-division-algorithm-visualised

Example: Euclid's division algorithm
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-numbers/x573d8ce20721c073:euclid-s-division-algorithm/v/euclids-division-algorithm-example

The fundamental theorem of arithmetic
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-numbers/x573d8ce20721c073:fundamental-theorem-of-arithmetic/v/the-fundamental-theorem-of-arithmetic-1

Prime factorization exercise
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-numbers/x573d8ce20721c073:fundamental-theorem-of-arithmetic/v/prime-factorization-exercise
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:real-numbers/xf0551d6b19cc0b04:fundamental-theorem-of-arithmetic/v/prime-factorisation-exercise-hindi

HCF visualized
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-numbers/x573d8ce20721c073:hcf-and-lcm/v/hcf-visualized
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:real-numbers/xf0551d6b19cc0b04:hcf-and-lcm/v/greatest-common-factor-explained-hindi

LCM visualized
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-numbers/x573d8ce20721c073:hcf-and-lcm/v/lcm-visualized
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:real-numbers/xf0551d6b19cc0b04:hcf-and-lcm/v/least-common-multiple-repeating-factor-hindi

HCF and LCM product
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-numbers/x573d8ce20721c073:hcf-and-lcm/v/hcf-and-lcm-product

Least common multiple of three numbers
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-numbers/x573d8ce20721c073:hcf-and-lcm/v/least-common-multiple-lcm
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:real-numbers/xf0551d6b19cc0b04:hcf-and-lcm/v/least-common-multiple-of-three-numbers-hindi

Proof: √2 is irrational
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-numbers/x573d8ce20721c073:proofs-irrational-numbers/v/proof-that-square-root-of-2-is-irrational
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:real-numbers/xf0551d6b19cc0b04:proofs-irrational-numbers/v/proof-2-is-irrational-hindi

Proof: square roots of prime numbers are irrational
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-numbers/x573d8ce20721c073:proofs-irrational-numbers/v/proof-that-square-root-of-prime-number-is-irrational
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:real-numbers/xf0551d6b19cc0b04:proofs-irrational-numbers/v/proof-square-roots-of-prime-numbers-are-irrational-hindi

Polynomials
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials#x573d8ce20721c073:polynomials

Zeros of polynomials introduction
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials/x573d8ce20721c073:geometrical-meaning-of-the-zeroes-of-a-polynomial/v/polynomial-zeros-introduction
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:polynomials/xf0551d6b19cc0b04:geometrical-meaning-of-the-zeroes-of-a-polynomial/v/zero-and-constant-polynomial-hindi

Zeros of polynomials: matching equation to graph
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials/x573d8ce20721c073:geometrical-meaning-of-the-zeroes-of-a-polynomial/v/polynomial-equation-from-graph
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:polynomials/xf0551d6b19cc0b04:geometrical-meaning-of-the-zeroes-of-a-polynomial/v/zeros-of-polynomials-their-graphs-hindi

Polynomial factors and graphs — Harder example
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials/x573d8ce20721c073:geometrical-meaning-of-the-zeroes-of-a-polynomial/v/sat-math-p11-harder

Intro to long division of polynomials
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials/x573d8ce20721c073:division-algorithm-for-polynomials/v/polynomial-division
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:polynomials/xf0551d6b19cc0b04:division-algorithm-for-polynomials/v/intro-to-long-division-of-polynomials-hindi

Dividing polynomials with remainders
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials/x573d8ce20721c073:division-algorithm-for-polynomials/v/dividing-polynomials-with-remainders
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:polynomials/xf0551d6b19cc0b04:division-algorithm-for-polynomials/v/dividing-polynomials-with-remainders-hindi

Zeros of polynomials (with factoring): grouping
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials/x573d8ce20721c073:division-algorithm-for-polynomials/v/polynomial-zeros-grouping

Pair of linear equations in two variables
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables#x573d8ce20721c073:pair-of-linear-equations-in-two-variables

Linear functions word problem: pool
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:graphical-method/v/graphing-linear-functions-2
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:pair-of-linear-equations-in-two-variables/xf0551d6b19cc0b04:graphical-method/v/linear-functions-word-problem-pool-hindi

Number of solutions to a system of equations
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:graphical-method/v/solving-systems-by-graphing-2
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:pair-of-linear-equations-in-two-variables/xf0551d6b19cc0b04:graphical-method/v/number-of-solutions-to-a-system-of-equations-graphically-hindi

Systems of equations with substitution
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:algebraic-methods/v/practice-using-substitution-for-systems
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:pair-of-linear-equations-in-two-variables/xf0551d6b19cc0b04:algebraic-methods/v/systems-of-equations-with-substitution-3x-4y-2-y2x-5-hindi

Systems of equations with elimination (and manipulation)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:algebraic-methods/v/solving-systems-of-equations-by-multiplication
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:pair-of-linear-equations-in-two-variables/xf0551d6b19cc0b04:algebraic-methods/v/systems-of-equations-with-elimination-and-manipulation-hindi

Number of solutions to a system of equations algebraically
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:number-of-solutions-algebraically/v/examples-algebraically-analyzing-solutions-to-systems
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:pair-of-linear-equations-in-two-variables/xf0551d6b19cc0b04:number-of-solutions-algebraically/v/number-of-solutions-to-a-system-of-equations-algebraically-hindi

Forming systems of eqn. with different no. of solns.
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:number-of-solutions-algebraically/v/constructing-solutions-to-systems-of-equations
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:pair-of-linear-equations-in-two-variables/xf0551d6b19cc0b04:number-of-solutions-algebraically/v/system-of-equations-word-problem-no-solution-hindi

Age word problem: Ben & William
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:linear-equations-word-problems/v/ex-3-age-word-problem
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:pair-of-linear-equations-in-two-variables/xf0551d6b19cc0b04:number-of-solutions-algebraically/v/system-of-equations-word-problem-infinite-solutions-hindi

System of equations word problem: walk & ride
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:linear-equations-word-problems/v/system-of-equations-distances-word-problem
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:pair-of-linear-equations-in-two-variables/xf0551d6b19cc0b04:linear-equations-word-problems/v/age-word-problem-arman-diya-hindi

Systems of equations with elimination: TV & DVD
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:linear-equations-word-problems/v/solving-systems-by-elimination
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:pair-of-linear-equations-in-two-variables/xf0551d6b19cc0b04:linear-equations-word-problems/v/system-of-equations-word-problem-walk-ride-hindi

Quadratic equations
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations#x573d8ce20721c073:quadratic-equations

Solving quadratics by factoring: leading coefficient ≠ 1
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:solving-equations-by-factorising/v/solving-quadratics-by-dividing-and-factoring
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:quadratic-equations/xf0551d6b19cc0b04:solving-equations-by-factorising/v/solving-quadratics-by-factoring-leading-coefficient-1-hindi

Solving quadratics using structure
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:solving-equations-by-factorising/v/using-structure-to-solve-quadratics
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:quadratic-equations/xf0551d6b19cc0b04:solving-equations-by-factorising/v/solving-quadratics-using-structure-hindi

Worked example: Solving equations by completing the square

https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:solving-equations-by-completing-the-square/v/solving-quadratics-by-completing-the-square
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:quadratic-equations/xf0551d6b19cc0b04:solving-equations-by-completing-the-square/v/worked-example-solving-equations-by-completing-the-square-hindi

Worked example: completing the square (leading coefficient ≠ 1)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:solving-equations-by-completing-the-square/v/completing-the-square-to-solve-quadratic-equations
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:quadratic-equations/xf0551d6b19cc0b04:solving-equations-by-completing-the-square/v/worked-example-completing-the-square-leading-coefficient-1-hindi

The quadratic formula
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:solving-equations-using-the-quadratic-formula/v/using-the-quadratic-formula
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:quadratic-equations/xf0551d6b19cc0b04:solving-equations-using-the-quadratic-formula/v/the-quadratic-formula-hindi

Worked example: quadratic formula (negative coefficients)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:solving-equations-using-the-quadratic-formula/v/applying-the-quadratic-formula
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:quadratic-equations/xf0551d6b19cc0b04:solving-equations-using-the-quadratic-formula/v/worked-example-quadratic-formula-negative-coefficients-hindi

Proof of the quadratic formula
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:solving-equations-using-the-quadratic-formula/v/proof-of-quadratic-formula
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:quadratic-equations/xf0551d6b19cc0b04:solving-equations-using-the-quadratic-formula/v/proof-of-the-quadratic-formula-hindi

Using the quadratic formula: number of solutions
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:nature-of-roots/v/quadratic-formula-3
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:quadratic-equations/xf0551d6b19cc0b04:nature-of-roots/v/using-the-quadratic-formula-number-of-solutions-hindi

Discriminant for types of solutions for a quadratic
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:nature-of-roots/v/discriminant-for-types-of-solutions-for-a-quadratic

Quadratic equations word problem: triangle dimensions
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:quadratic-equations-word-problems/v/example-4-solving-a-quadratic-equation-by-factoring
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:quadratic-equations/xf0551d6b19cc0b04:quadratic-equations-word-problems/v/quadratic-equations-word-problem-triangle-dimensions-hindi

Quadratic equations word problem: box dimensions
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:quadratic-equations-word-problems/v/example-3-solving-a-quadratic-equation-by-factoring
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:quadratic-equations/xf0551d6b19cc0b04:quadratic-equations-word-problems/v/quadratic-equations-word-problem-box-dimensions-hindi

Quadratic word problem: ball
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:quadratic-equations-word-problems/v/application-problem-with-quadratic-formula

Arithmetic progressions
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions#x573d8ce20721c073:arithmetic-progressions

Intro to arithmetic progressions
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:intro-to-arithmetic-progressions/v/intro-to-arithmetic-progressions-arithmetic-progressions
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:arithmetic-progressions/xf0551d6b19cc0b04:intro-to-arithmetic-progresssions/v/intro-to-arithmetic-sequences-hindi

Extending arithmetic sequences
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:intro-to-arithmetic-progressions/v/extending-arithmetic-sequences
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:arithmetic-progressions/xf0551d6b19cc0b04:intro-to-arithmetic-progresssions/v/extending-arithmetic-sequences-hindi

Using arithmetic sequences formulas
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:intro-to-arithmetic-progressions/v/using-arithmetic-sequences-formulas
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:arithmetic-progressions/xf0551d6b19cc0b04:intro-to-arithmetic-progresssions/v/using-arithmetic-sequences-formulas-hindi

Explicit formulas for arithmetic sequences
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:intro-to-arithmetic-progressions/v/explicit-formulas-for-arithmetic-sequences
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:arithmetic-progressions/xf0551d6b19cc0b04:intro-to-arithmetic-progresssions/v/explicit-formulas-for-arithmetic-sequences-hindi

Nth term of an arithmetic progression
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:nth-term-of-an-ap/v/nth-term-of-an-arithmetic-progression-arithmetic-progressions

Arithmetic sequence problem
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:nth-term-of-an-ap/v/finding-the-100th-term-in-a-sequence
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:arithmetic-progressions/xf0551d6b19cc0b04:nth-term-of-an-ap/v/arithmetic-sequence-problem-hindi

Arithmetic series intro
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:sum-of-first-n-terms-of-an-ap/v/sum-of-arithmetic-sequence-arithmetic-series
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:arithmetic-progressions/xf0551d6b19cc0b04:sum-of-first-n-terms-of-an-ap/v/arithmetic-series-intro-hindi

Arithmetic series formula
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:sum-of-first-n-terms-of-an-ap/v/formula-for-arithmetic-series
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:arithmetic-progressions/xf0551d6b19cc0b04:sum-of-first-n-terms-of-an-ap/v/arithmetic-series-formula-hindi

Worked example: arithmetic series (sum expression)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:sum-of-first-n-terms-of-an-ap/v/evaluating-arithmetic-sum-example
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:arithmetic-progressions/xf0551d6b19cc0b04:sum-of-first-n-terms-of-an-ap/v/worked-example-arithmetic-series-sum-expression-hindi

Arithmetic progression applied to divisibility
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:ap-word-problems/v/arithmetic-progression-applied-to-divisibility

Sequences word problem: growth pattern
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:ap-word-problems/v/equations-of-sequence-patterns
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:arithmetic-progressions/xf0551d6b19cc0b04:ap-word-problems/v/sequences-word-problem-growth-pattern-hindi

Triangles
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:triangles#x573d8ce20721c073:triangles

Intro to triangle similarity
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:triangles/x573d8ce20721c073:similarity-of-triangles/v/similar-triangle-basics
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:triangles/xf0551d6b19cc0b04:similarity-of-triangles/v/intro-to-triangle-similarity-hindi

Triangle similarity postulates/criteria
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:triangles/x573d8ce20721c073:similarity-of-triangles/v/similarity-postulates
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:triangles/xf0551d6b19cc0b04:similarity-of-triangles/v/triangle-similarity-postulatescriteria-hindi

Determining similar triangles
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:triangles/x573d8ce20721c073:similarity-of-triangles/v/similar-triangle-example-problems
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:triangles/xf0551d6b19cc0b04:similarity-of-triangles/v/determining-similar-triangles-hindi

Solving similar triangles
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:triangles/x573d8ce20721c073:problems-involving-similar-triangles/v/similarity-example-problems
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:triangles/xf0551d6b19cc0b04:problems-involving-similar-triangles/v/solving-similar-triangles-hindi

Solving similar triangles: same side plays different roles
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:triangles/x573d8ce20721c073:problems-involving-similar-triangles/v/similarity-example-where-same-side-plays-different-roles
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:triangles/xf0551d6b19cc0b04:problems-involving-similar-triangles/v/solving-similar-triangles-same-side-plays-different-roles-hindi

Using similar & congruent triangles
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:triangles/x573d8ce20721c073:problems-involving-similar-triangles/v/finding-area-using-similarity-and-congruence
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:triangles/xf0551d6b19cc0b04:problems-involving-similar-triangles/v/using-similar-congruent-triangles-hindi

Challenging similarity problem
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:triangles/x573d8ce20721c073:problems-involving-similar-triangles/v/challenging-similarity-problem
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:triangles/xf0551d6b19cc0b04:problems-involving-similar-triangles/v/challenging-similarity-problem-hindi

Pythagorean theorem proof using similarity
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:triangles/x573d8ce20721c073:pythagoras-theorem/v/pythagorean-theorem-proof-using-similarity
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:triangles/xf0551d6b19cc0b04:pythagoras-theorem/v/intro-to-the-pythagoras-theorem-hindi

Pythagorean theorem word problem: fishing boat
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:triangles/x573d8ce20721c073:pythagoras-theorem/v/pythagorean-theorem-1
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:triangles/xf0551d6b19cc0b04:pythagoras-theorem/v/pythagorean-theorem-example-hindi

Coordinate geometry
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:coordinate-geometry#x573d8ce20721c073:coordinate-geometry

Finding distance with Pythagorean theorem
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:coordinate-geometry/x573d8ce20721c073:distance-formula/v/example-finding-distance-with-pythagorean-theorem
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:coordinate-geometry/xf0551d6b19cc0b04:distance-formula/v/finding-distance-with-pythagorean-theorem-hindi

Distance formula
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:coordinate-geometry/x573d8ce20721c073:distance-formula/v/distance-formula
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:coordinate-geometry/xf0551d6b19cc0b04:distance-formula/v/distance-formula-hindi

Ratio in which a point divides a line segment
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:coordinate-geometry/x573d8ce20721c073:section-formula/v/ratio-in-which-a-point-divides-a-line-segment

Ratio in which a line divides a line segment
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:coordinate-geometry/x573d8ce20721c073:section-formula/v/ratio-in-which-a-line-divides-a-line-segment
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:coordinate-geometry/xf0551d6b19cc0b04:section-formula/v/dividing-line-segments-hindi

Midpoint formula
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:coordinate-geometry/x573d8ce20721c073:mid-point-formula/v/midpoint-formula
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:coordinate-geometry/xf0551d6b19cc0b04:mid-point-formula/v/midpoint-formula-hindi

Area of triangle from coordinates example
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:coordinate-geometry/x573d8ce20721c073:area-of-a-triangle/v/area-of-triangle-example-coordinate-geometry

Area of triangle formula derivation
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:coordinate-geometry/x573d8ce20721c073:area-of-a-triangle/v/area-of-triangle-formula-derivation

Introduction to trigonometry
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry#x573d8ce20721c073:introduction-to-trigonometry

Intro to the trigonometric ratios
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:into-to-trigonometric-ratios/v/basic-trigonometry
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:introduction-to-trigonometry/xf0551d6b19cc0b04:intro-to-trigonometric-ratios/v/intro-to-the-trigonometric-ratios-hindi

Trigonometric ratios in right triangles
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:into-to-trigonometric-ratios/v/basic-trigonometry-ii
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:introduction-to-trigonometry/xf0551d6b19cc0b04:intro-to-trigonometric-ratios/v/trigonometric-ratios-in-right-triangles-hindi

Solving for a side in right triangles with trigonometry
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:into-to-trigonometric-ratios/v/example-trig-to-solve-the-sides-and-angles-of-a-right-triangle
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:introduction-to-trigonometry/xf0551d6b19cc0b04:intro-to-trigonometric-ratios/v/solving-for-a-side-in-right-triangles-with-trigonometry-hindi

Finding reciprocal trig ratios
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:reciprocal-trigonometric-ratios/v/example-the-six-trig-ratios
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:introduction-to-trigonometry/xf0551d6b19cc0b04:reciprocal-trigonometric-ratios/v/finding-reciprocal-trig-ratios-hindi

Using reciprocal trig ratios
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:reciprocal-trigonometric-ratios/v/example-using-trig-to-solve-for-missing-information
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:introduction-to-trigonometry/xf0551d6b19cc0b04:reciprocal-trigonometric-ratios/v/using-reciprocal-trig-ratios-hindi

Special right triangles intro (part 1)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:trigonometric-ratios-of-some-specific-angles/v/45-45-90-triangles
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:introduction-to-trigonometry/xf0551d6b19cc0b04:trigonometric-ratios-of-some-specific-angles/v/trigonometric-ratios-of-45-degree-angle-hindi

Special right triangles intro (part 2)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:trigonometric-ratios-of-some-specific-angles/v/intro-to-30-60-90-triangles
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:introduction-to-trigonometry/xf0551d6b19cc0b04:trigonometric-ratios-of-some-specific-angles/v/trigonometric-ratios-of-30-and-60-degrees-hindi

30-60-90 triangle example problem
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:trigonometric-ratios-of-some-specific-angles/v/30-60-90-triangle-example-problem

Special right triangles proof (part 1)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:trigonometric-ratios-of-some-specific-angles/v/30-60-90-triangle-side-ratios-proof

Special right triangles proof (part 2)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:trigonometric-ratios-of-some-specific-angles/v/45-45-90-triangle-side-ratios

Sine & cosine of complementary angles
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:trigonometric-ratios-of-complementary-angles/v/showing-relationship-between-cosine-and-sine-of-complements
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:introduction-to-trigonometry/xf0551d6b19cc0b04:trigonometric-ratios-of-complementary-angles/v/sine-cosine-of-complementary-angles-hindi

Finding trig. ratios of complementary angles (worked examples)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:trigonometric-ratios-of-complementary-angles/v/worked-examples-trigonometric-ratios-of-complementary-angles
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:introduction-to-trigonometry/xf0551d6b19cc0b04:trigonometric-ratios-of-complementary-angles/v/trig-word-problem-complementary-angles-hindi

Intro to Pythagorean trig identities
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:trigonometric-identities/v/intro-to-pythagorean-trigonometric-identities
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:introduction-to-trigonometry/xf0551d6b19cc0b04:trigonometric-identities/v/intro-to-the-pythagorean-trig-identity-hindi

Convert between trig ratios eg.: write all ratios in terms of sin
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:trigonometric-identities/v/writing-a-trigonometric-ratio-in-terms-other-ratios
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:introduction-to-trigonometry/xf0551d6b19cc0b04:trigonometric-identities/v/intro-to-the-pythagorean-trig-identity-2-hindi

Trig identity example proof involving sec, sin, and cos
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:trigonometric-identities/v/example-1-proving-trigonometric-identities

Trig identity example proof involving sin, cos, and tan
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:trigonometric-identities/v/example-2-proving-trigonometric-identities

Trig identity example proof involving all the six ratios
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:introduction-to-trigonometry/x573d8ce20721c073:trigonometric-identities/v/example-3-proving-trigonometric-identities

Some applications of trigonometry
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:some-applications-of-trigonometry#x573d8ce20721c073:some-applications-of-trigonometry

Intro to heights and distances
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:some-applications-of-trigonometry/x573d8ce20721c073:one-triangle-problems/v/intro-to-heights-and-distances

Heights and distances word problem: distance between two buildings
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:some-applications-of-trigonometry/x573d8ce20721c073:two-triangles-problems/v/example-1-heights-and-distances
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:some-applications-of-trigonometry/xf0551d6b19cc0b04:one-triangle-problems/v/right-triangle-word-problem-hindi

Heights and distances word problem: height of a cloud above a lake
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:some-applications-of-trigonometry/x573d8ce20721c073:two-triangles-problems/v/example-2-heights-and-distances
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:some-applications-of-trigonometry/xf0551d6b19cc0b04:two-triangle-problems/v/example-heights-and-distances-hindi

Circles
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:circles#x573d8ce20721c073:circles

Proof: Radius is perpendicular to tangent line
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:circles/x573d8ce20721c073:tangent-to-a-circle/v/proving-radius-is-perpendicular-to-tangent-line
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:circles/xf0551d6b19cc0b04:tangent-to-a-circle/v/proof-radius-is-perpendicular-to-tangent-line-hindi

Tangents of circles problem (example 3)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:circles/x573d8ce20721c073:tangent-to-a-circle/v/example-with-tangent-and-radius
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:circles/xf0551d6b19cc0b04:tangent-to-a-circle/v/tangents-of-circles-problem-example-3-hindi

Proof: Segments tangent to circle from outside point are congruent
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:circles/x573d8ce20721c073:number-of-tangents-from-a-point-to-a-circle/v/segments-tangent-to-circle-from-outside-point-congruent
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:circles/xf0551d6b19cc0b04:number-of-tangents-from-a-point-to-a-circle/v/proof-segments-tangent-to-circle-from-outside-point-are-congruent-hindi

Tangents of circles problem (example 1)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:circles/x573d8ce20721c073:number-of-tangents-from-a-point-to-a-circle/v/tangents-of-circles-exercise-examples
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:circles/xf0551d6b19cc0b04:number-of-tangents-from-a-point-to-a-circle/v/tangents-of-circles-problem-example-1-hindi

Tangents of circles problem (example 2)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:circles/x573d8ce20721c073:number-of-tangents-from-a-point-to-a-circle/v/measure-of-circumscribed-angle
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:circles/xf0551d6b19cc0b04:number-of-tangents-from-a-point-to-a-circle/v/tangents-of-circles-problem-example-2-hindi

Areas related to circles
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:areas-related-to-circles#x573d8ce20721c073:areas-related-to-circles

Angles, arc lengths, and trig functions
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:areas-related-to-circles/x573d8ce20721c073:perimeter-of-circular-figures/v/sat-math-s4-harder
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:areas-related-to-circles/xf0551d6b19cc0b04:perimeter-of-circular-figures/v/arc-length-from-subtended-angle-hindi

Finding circumference of a circle when given the area
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:areas-related-to-circles/x573d8ce20721c073:perimeter-of-circular-figures/v/circumference-from-area
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:areas-related-to-circles/xf0551d6b19cc0b04:perimeter-of-circular-figures/v/arc-length-as-fraction-of-circumference-hindi

Partial circle area and arc length
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:areas-related-to-circles/x573d8ce20721c073:areas-of-sector-and-segment-of-a-circle/v/partial-circle-area-and-arc-length
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:areas-related-to-circles/xf0551d6b19cc0b04:areas-of-sector-and-segment-of-a-circle/v/partial-circle-area-and-arc-length-hindi

Area of a sector
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:areas-related-to-circles/x573d8ce20721c073:areas-of-sector-and-segment-of-a-circle/v/area-of-a-sector-given-a-central-angle
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:areas-related-to-circles/xf0551d6b19cc0b04:areas-of-sector-and-segment-of-a-circle/v/area-of-a-sector-hindi

Area of a shaded region
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:areas-related-to-circles/x573d8ce20721c073:areas-of-combination-of-plane-figures/v/area-of-shaded-region
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:areas-related-to-circles/xf0551d6b19cc0b04:areas-of-combination-of-plane-figures/v/area-of-a-shaded-region-hindi

Surface areas and volumes
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:surface-areas-and-volumes#x573d8ce20721c073:surface-areas-and-volumes

Area of combination of solids
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:surface-areas-and-volumes/x573d8ce20721c073:combination-of-solids/v/surface-area-of-combination-of-solids-surface-area-and-volume

Problem types: surface area of combination of solids
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:surface-areas-and-volumes/x573d8ce20721c073:combination-of-solids/v/surface-area-of-combination-of-solids-problem-types

Volume of combination of solids
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:surface-areas-and-volumes/x573d8ce20721c073:combination-of-solids/v/volume-of-combination-of-solids

Problem types: volume of combination of solids
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:surface-areas-and-volumes/x573d8ce20721c073:combination-of-solids/v/volume-of-combination-solids-problem-types

Volume word problem: gold ring
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:surface-areas-and-volumes/x573d8ce20721c073:conversion-of-solids/v/volume-of-gold-ring

Volume of rectangles inside rectangles
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:surface-areas-and-volumes/x573d8ce20721c073:conversion-of-solids/v/crates-in-boxcar

Curved surface area of a frustum
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:surface-areas-and-volumes/x573d8ce20721c073:frustum-of-a-cone/v/curved-surface-area-of-a-frustum-surface-areas-and-volumes

Volume of a frustum
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:surface-areas-and-volumes/x573d8ce20721c073:frustum-of-a-cone/v/volume-of-a-frustum

Statistics
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:statistics#x573d8ce20721c073:statistics

Probability
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:probability#x573d8ce20721c073:probability

Intro to theoretical probability
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:probability/x573d8ce20721c073:probability-a-theoretical-approach/v/basic-probability
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:probability/xf0551d6b19cc0b04:probability-a-theoretical-approach/v/intro-to-theoretical-probability-12-hindi

Theoretical and experimental probabilities
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:probability/x573d8ce20721c073:probability-a-theoretical-approach/v/comparing-theoretical-to-experimental-probabilites
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:probability/xf0551d6b19cc0b04:probability-a-theoretical-approach/v/theoretical-and-experimental-probabilites-hindi

Simple probability: non-blue marble
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:probability/x573d8ce20721c073:probability-a-theoretical-approach/v/probability-1-module-examples
https://www.khanacademy.org/math/in-in-class-10-math-cbse-hindi/xf0551d6b19cc0b04:probability/xf0551d6b19cc0b04:probability-a-theoretical-approach/v/simple-probability-non-blue-marble-hindi

Compound probability of independent events
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:probability/x573d8ce20721c073:independent-events/v/compound-probability-of-independent-events

Independent events example: test taking
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:probability/x573d8ce20721c073:independent-events/v/independent-events-2

Dependent probability introduction
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:probability/x573d8ce20721c073:dependent-events/v/introduction-to-dependent-probability

Independent & dependent probability
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:probability/x573d8ce20721c073:dependent-events/v/independent-events-1

Dependent probability: coins
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:probability/x573d8ce20721c073:dependent-events/v/dependent-probability-example-1

Probability with Venn diagrams
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:probability/x573d8ce20721c073:adding-probabilities/v/probability-with-playing-cards-and-venn-diagrams

Addition rule for probability
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:probability/x573d8ce20721c073:adding-probabilities/v/addition-rule-for-probability

...........................................................................
Math Exercises:

Real Numbers
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-No.s#x573d8ce20721c073:real-No.s

HCF through Euclid's division algorithm
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-No.s/x573d8ce20721c073:euclid-s-division-algorithm/e/euclid-s-division-algorithm-intermediate Exercise 1.1

Prime factorization of larger nos.
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-No.s/x573d8ce20721c073:fundamental-theorem-of-arithmetic/e/prime-factorisation-of-large-No.s Exercise 1.2

Finding HCF & LCM of large nos.
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-No.s/x573d8ce20721c073:hcf-and-lcm/e/finding-hcf-of-No.s Exercise 1.2

HCF & LCM = product of nos.
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-No.s/x573d8ce20721c073:hcf-and-lcm/e/lcm-hcf-product Exercise 1.2

HCF & LCM of three nos.
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-No.s/x573d8ce20721c073:hcf-and-lcm/e/hcf-and-lcm-of-three-No.s Exercise 1.2

Identifying terminating decimals
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-No.s/x573d8ce20721c073:rational-No.s-and-their-decimal-expansions/e/identifying-terminating-decimals Exercise 1.4

Unit test on Real Numbers
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:real-No.s/test/x573d8ce20721c073:real-No.s-unit-test?modal=1 Chapter Assessment

Polynomials
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials#x573d8ce20721c073:polynomials

Zeros of polynomial
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials/x573d8ce20721c073:geometrical-meaning-of-the-zeroes-of-a-polynomial/e/zeros-of-a-polynomial-in HOTS

Finding No. of roots using graph
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials/x573d8ce20721c073:geometrical-meaning-of-the-zeroes-of-a-polynomial/e/finding-No.-of-roots-using-graph Exercise 2.1

Finding the polynomial with sum and product of roots given
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials/x573d8ce20721c073:relationship-between-zeroes-and-coefficients/e/finding-the-polynomial-whose-sum-and-product-of-roots-is-given Exercise 2.2

Relation between coefficients and roots of a quadratic
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials/x573d8ce20721c073:relationship-between-zeroes-and-coefficients/e/relation-between-coefficients-and-roots-of-a-quadratic-equation

Finding the unknown through sum and product of roots
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials/x573d8ce20721c073:relationship-between-zeroes-and-coefficients/e/finding-the-unknown-through-sum-and-product-of-roots Exercise 2.2 (Board level)

Relation between coefficients and roots of a cubic
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials/x573d8ce20721c073:relationship-between-zeroes-and-coefficients/e/relation-between-coefficients-and-roots-of-a-cubic-equation Exercise 2.4

Divide polynomials by linear expressions
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials/x573d8ce20721c073:division-algorithm-for-polynomials/e/divide-polynomials-by-binomials Exercise 2.3

Divide polynomials with remainders
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials/x573d8ce20721c073:division-algorithm-for-polynomials/e/dividing-polynomials-with-remainders Exercise 2.3

Zeros of polynomials (with factoring)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials/x573d8ce20721c073:division-algorithm-for-polynomials/e/find-the-zeros-of-polynomials Exercise 2.3

Unit test on Polynomials
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:polynomials/test/x573d8ce20721c073:polynomials-unit-test?modal=1 Chapter Assessment

Pair of linear equations in two variables
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables#x573d8ce20721c073:pair-of-linear-equations-in-two-variables

Graphing linear relationships word problems
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:graphical-method/e/graphing-linear-functions-word-problems Exercise 3.1

No. of solutions to a system of equations graphically
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:graphical-method/e/graphical-solutions-to-systems Exercise 3.2

Systems of equations with substitution
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:algebraic-methods/e/systems_of_equations_with_substitution Exercise 3.3

Systems of equations with elimination
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:algebraic-methods/e/systems_of_equations_with_elimination_0.5 Exercise 3.4

Systems of equations with elimination challenge
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:algebraic-methods/e/systems_of_equations_with_elimination Exercise 3.4 (Board Level)

Solving system of equations through cross multiplication
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:algebraic-methods/e/solving-pair-of-linear-equations-through-cross-multiplication Exercise 3.5

No. of solutions of system of equations
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:No.-of-solutions-algebraically/e/given-equation-find-no-of-solutions Exercise 3.5

No. of solutions to systems of equations (intermediate)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:No.-of-solutions-algebraically/e/given-solution-find-variable Exercise 3.5 (Board level)

Solving equations reducible to linear form
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:equations-reducible-to-linear-form/e/solving-equations-reducible-to-linear-form Exercise 3.6

Word problems: Writing equations reducible to linear form
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:equations-reducible-to-linear-form/e/word-problems--writing-equations-reducible-to-linear-form Exercise 3.6

Identifying substitutions: Equations reducible to linear form
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:equations-reducible-to-linear-form/e/identifying-substitutions--equations-reducible-to-linear-form Exercise 3.6

Age word problems
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:linear-equations-word-problems/e/age_word_problems Exercise 3.6 and Exercise 3.7

Systems of equations word problems
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:linear-equations-word-problems/e/understanding-systems-of-equations-word-problems Exercise 3.6 and Exercise 3.7

Forming equations with two variables
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:linear-equations-word-problems/e/writing-equations-in-two-variables Exercise 3.6 and Exercise 3.7

Word problems involving pair of linear equations
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/x573d8ce20721c073:linear-equations-word-problems/e/word-problems-involving-pair-of-linear-equations-advanced Exercise 3.6 and Exercise 3.7

Unit test on Pair of linear equations in two variables
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:pair-of-linear-equations-in-two-variables/test/x573d8ce20721c073:pair-of-linear-equations-in-two-variables-unit-test?modal=1 Chapter Assessment

Quadratic equations
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations#x573d8ce20721c073:quadratic-equations

Quadratics by factoring
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:solving-equations-by-factorising/e/solving_quadratics_by_factoring_2 Exercise 4.2

Quadratic equations with irrational and variable coeff.
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:solving-equations-by-factorising/e/quadratic-equations-with-irrational-and-variable-coefficients Exercise 4.2

Solve equations using structure
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:solving-equations-by-factorising/e/solving-quadratics-by-using-structure Exercise 4.2

Completing the square (intermediate)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:solving-equations-by-completing-the-square/e/completing_the_square_1 Exercise 4.3

Completing the square
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:solving-equations-by-completing-the-square/e/completing_the_square_2 Exercise 4.3

Quadratic formula
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:solving-equations-using-the-quadratic-formula/e/quadratic_equation Exercise 4.3

Equations reducible to quadratic equations
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:solving-equations-using-the-quadratic-formula/e/equations-reducible-to-quadratic-equations Exercise 4.3

Equations reducible to quadratic equations (advanced)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:solving-equations-using-the-quadratic-formula/e/equations-reducible-to-quadratic-equations-challenge-problems Exercise 4.3 (Board level)

No. of solutions of quadratic equations
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:nature-of-roots/e/determine-the-No.-of-solutions-of-a-quadratic-equation Exercise 4.4

Equations with equal roots (intermediate)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:nature-of-roots/e/finding-quadratic-equations-using-nature-of-roots Exercise 4.4

Equations with equal roots (advanced)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:nature-of-roots/e/equations-with-equal-roots--advanced- Exercise 4.4 (Board level)

Finding nature of roots
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:nature-of-roots/e/finding-nature-of-roots Exercise 4.4

Word problems: Writing quadratic equations
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:quadratic-equations-word-problems/e/writing-quadratic-equations-word-problems Exercise 4.4 Word problems

Word problems: Solving quadratic equations
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:quadratic-equations-word-problems/e/word-problems--quadratic-equations Exercise 4.4 Word problems

Quadratic equations word problems (basic)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:quadratic-equations-word-problems/e/quadratic-equations-word-problems--basic Exercise 4.4 Word problems

Quadratic equations word problems (intermediate)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:quadratic-equations-word-problems/e/quadratic-equations-word-problems-intermediate Exercise 4.4 Word problems

Quadratic equations word problems (advanced)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/x573d8ce20721c073:quadratic-equations-word-problems/e/quadratic-equations-word-problems--advanced Exercise 4.4 Word problems

Unit test on Quadratic equations
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:quadratic-equations/test/x573d8ce20721c073:quadratic-equations-unit-test?modal=1 Chapter Assessment

Arithmetic progressions
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions#x573d8ce20721c073:arithmetic-progressions

Extend arithmetic sequences
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:intro-to-arithmetic-progressions/e/arithmetic_sequences_1 Exercise 5.1

Explicit formulas for arithmetic sequences
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:intro-to-arithmetic-progressions/e/explicit-formulas-for-arithmetic-sequences Exercise 5.1

Common difference (intermediate)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:common-difference-of-an-ap/e/consecutive-terms-of-an-ap Exercise 5.1

Middle term of an arithmetic progression
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:common-difference-of-an-ap/e/finding-the-middle-term-of-an-arithmetic-sequence- Exercise 5.1

Common difference (advanced)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:common-difference-of-an-ap/e/finding-the-arithmetic-sequence-using-sum-of-two-terms- Exercise 5.1

nth term of an arithmetic progression (basic)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:nth-term-of-an-ap/e/exercise-1 Exercise 5.2

nth term of an arithmetic progression (intermediate)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:nth-term-of-an-ap/e/difference-problems Exercise 5.2

nth term of an arithmetic progression (advanced)
https://www.khanacademy.org/math/in-in-grade-10-ncert/x573d8ce20721c073:arithmetic-progressions/x573d8ce20721c073:nth-term-of-an-ap/e/ap-advanced-an-last-exercise Exercise 5.2 (Board level)