Khan Academy Class 4 (NCERT) Math Videos and Exercises

Math Videos:

Addition and subtraction
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:addition-and-subtraction

Using place value to add 3-digit numbers: part 1
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:addition-and-subtraction/x37a2a840963ae149:3-digit-addition/v/carrying-when-adding-three-digit-numbers

Using place value to add 3-digit numbers: part 2
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:addition-and-subtraction/x37a2a840963ae149:3-digit-addition/v/why-carrying-works

Adding 3-digit numbers
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:addition-and-subtraction/x37a2a840963ae149:3-digit-addition/v/example-adding-with-carrying

Methods for subtracting 3-digit numbers
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:addition-and-subtraction/x37a2a840963ae149:3-digit-subtraction/v/methods-for-subracting-3-digit-numbers

Worked example: Subtracting 3-digit numbers
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:addition-and-subtraction/x37a2a840963ae149:3-digit-subtraction/v/regrouping-twice-when-subtracting-three-digit-numbers

Multiplication
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication

Using area model and properties to multiply
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multiply-by-using-area-model/v/more-ways-to-think-about-multiplying

Multiplying with area model: 78 x 65
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multiply-by-using-area-model/v/understanding-multiplication-through-area-models

Multiplying with distributive property
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multiply-by-using-distributive-property/v/2-digit-multiplication-with-grid

Multiplying 2-digit by 1-digit
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multiply-by-1-digit-numbers/v/2-digit-times-1-digit-example-no-carrying

Multiplying 3-digit by 1-digit
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multiply-by-1-digit-numbers/v/3-digit-times-1-digit-example-no-carrying

Multiplying 3-digit by 1-digit (regrouping)
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multiply-by-1-digit-numbers/v/3-digit-times-1-digit-example

Multiplying 4-digit by 1-digit (regrouping)
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multiply-by-1-digit-numbers/v/4-digit-times-1-digit-example

Multiplying 2-digit numbers
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multi-digit-multiplication/v/multiplying-2-digit-numbers

Multiplying multi-digit numbers
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multi-digit-multiplication/v/multiplication-6-multiple-digit-numbers

Division
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division

Relating division to multiplication
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division/x37a2a840963ae149:intro-to-division/v/examples-relating-multiplication-to-division

Division using place value
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division/x37a2a840963ae149:division-place-value-and-area/v/division-using-understanding-of-place-value

Division with area models
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division/x37a2a840963ae149:division-place-value-and-area/v/area-models-to-visualize-division-using-place-value

Quotients that are multiples of 10
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division/x37a2a840963ae149:divide-by-1-digit-numbers/v/quotients-that-are-multiples-of-10

Intro to long division (no remainders)
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division/x37a2a840963ae149:multi-digit-division-no-remainders/v/long-division-without-remainder

Long division: 280÷5
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division/x37a2a840963ae149:multi-digit-division-no-remainders/v/dividing-3-digit-by-1-digit-without-remainder

Introduction to dividing by 2-digits
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division/x37a2a840963ae149:multi-digit-division-no-remainders/v/introduction-to-dividing-by-2-digits

Smart charts
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:smart-charts

Picture graphs
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:smart-charts/x37a2a840963ae149:picture-graphs/v/picture-graphs

Making picture graphs and line plots
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:smart-charts/x37a2a840963ae149:picture-graphs/v/making-line-plots

Reading bar graphs: dog bones
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:smart-charts/x37a2a840963ae149:bar-charts/v/reading-bar-graph-examples

Creating a bar graph
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:smart-charts/x37a2a840963ae149:bar-charts/v/creating-bar-charts-1

Halves and quarters
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:halves-and-quarters

Halves and fourths
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:halves-and-quarters/x37a2a840963ae149:fractions-of-shapes/v/halves-and-fourths

Equal parts of circles and rectangles
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:halves-and-quarters/x37a2a840963ae149:fractions-of-shapes/v/equal-parts-of-circles-and-rectangles

Geometry and measurement
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement

Metric system: units of distance
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:length/v/metric-distance

Understanding volume (liters)
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:volume/v/liter-intuition

Word problems with volume
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:volume/v/arithmetic-word-problems-with-volume

Understanding mass (grams and kilograms)
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:mass/v/intuition-for-grams

Word problems with mass
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:mass/v/mass-problems

Telling time (labeled clock)
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:time/v/telling-time-exercise-example-1

Telling time (unlabeled clock)
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:time/v/telling-time-exercise-example-2

Perimeter: introduction
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:perimeter/v/introduction-to-perimeter

Finding perimeter when a side length is missing
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:perimeter/v/finding-perimeter-when-a-side-length-is-missing-math-3rd-grade-khan-academy

Transitioning from unit squares to area formula
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:area/v/transitioning-from-counting-to-multiplying-to-find-area-3rd-grade-khan-academy

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Math Exercises:

Addition and subtraction
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:addition-and-subtraction

Select strategies for adding within 1000
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:addition-and-subtraction/x37a2a840963ae149:3-digit-addition/e/select-strategies-for-adding-within-1000

Add within 1000
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:addition-and-subtraction/x37a2a840963ae149:3-digit-addition/e/addition_4

Subtract on a number line
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:addition-and-subtraction/x37a2a840963ae149:3-digit-subtraction/e/subtract-on-a-number-line

Subtract within 1000
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:addition-and-subtraction/x37a2a840963ae149:3-digit-subtraction/e/subtraction_4

Unit test on Addition and subtraction
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:addition-and-subtraction/x37a2a840963ae149:3-digit-subtraction/t/x37a2a840963ae149:addition-and-subtraction-unit-test

Multiplication
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication

Multiply 2-digits by 1-digit with area models
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multiply-by-using-area-model/e/multiply-2--digits-by-1-digit-with-area-models

Multiply 2-digit numbers with area models
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multiply-by-using-area-model/e/multiplying-2-digit-numbers-with-area-models

Multiply 2-digits by 1-digit with distributive property
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multiply-by-using-distributive-property/e/multiplication-with-place-value-understanding

Multiply 3- and 4-digits by 1-digit with distributive property
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multiply-by-using-distributive-property/e/multiply-3--and-4-digits-by-1-digit-with-distributive-property

Multiply without regrouping
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multiply-by-1-digit-numbers/e/multiplication_1.5

Multiply with regrouping
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multiply-by-1-digit-numbers/e/multiplication_2

Multiply 2-digit numbers
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multi-digit-multiplication/e/multiplication_3

Multi-digit multiplication
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multi-digit-multiplication/e/multiplication_4

Unit test on Multiplication
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:multiplication/x37a2a840963ae149:multi-digit-multiplication/t/x37a2a840963ae149:multiplication-unit-test

Division
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division

Relate division to multiplication
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division/x37a2a840963ae149:intro-to-division/e/relate-division-to-multiplication

Relate multiplication and division equations
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division/x37a2a840963ae149:intro-to-division/e/find-missing-value-in-related-multiplication-and-division-equations

Fact families
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division/x37a2a840963ae149:intro-to-division/e/fact-families

Divide using place value
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division/x37a2a840963ae149:division-place-value-and-area/e/division-using-place-value-understanding

Divide by 1-digit numbers with area models
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division/x37a2a840963ae149:division-place-value-and-area/e/multi-digit-division-with-visual-models

Divide multiples of 10, 100, and 1,000 by 1-digit numbers
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division/x37a2a840963ae149:divide-by-1-digit-numbers/e/quotients-that-are-multiples-of-10

Create division equations with area models
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division/x37a2a840963ae149:multi-digit-division-no-remainders/e/create-division-equations-with-area-models

Unit test on Division
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:division/x37a2a840963ae149:multi-digit-division-no-remainders/t/x37a2a840963ae149:division-unit-test

Smart charts
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:smart-charts

Solve problems with picture graphs
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:smart-charts/x37a2a840963ae149:picture-graphs/e/solving-problems-with-picture-graphs-1

Make picture graphs
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:smart-charts/x37a2a840963ae149:picture-graphs/e/make-picture-graphs-1

Solve problems with bar graphs 1
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:smart-charts/x37a2a840963ae149:bar-charts/e/solving-problems-with-bar-graphs-1

Make bar graphs
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:smart-charts/x37a2a840963ae149:bar-charts/e/make-bar-graphs-1

Unit test on Smart charts
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:smart-charts/x37a2a840963ae149:bar-charts/t/x37a2a840963ae149:smart-charts-unit-test

Halves and quarters
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:halves-and-quarters

Halves
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:halves-and-quarters/x37a2a840963ae149:fractions-of-shapes/e/halves-and-fourths

Equal parts of rectangles
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:halves-and-quarters/x37a2a840963ae149:fractions-of-shapes/e/equal-parts-of-circles-and-rectangles

Geometry and measurement
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement

Estimating length (mm, cm, m, km)
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:length/e/estimating-length--millimeters--centimeters--meters--kilometers-

Estimate volume (milliliters and liters)
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:volume/e/estimating-volume

Word problems with volume
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:volume/e/volume-word-problems-1

Estimate mass (grams and kilograms)
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:mass/e/estimating-mass

Word problems with mass
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:mass/e/measure-mass

Tell time to hour or half hour
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:time/e/tell-time-to-hour-or-half-hour

Telling time on a clock
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:time/e/telling_time_0.5

Telling time on a number line
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:time/e/telling_time

Find perimeter by counting units
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:perimeter/e/perimeter_1

Find perimeter when given side lengths
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:perimeter/e/perimeter-2

Area of rectangles with partial arrays
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:area/e/area-of-rectangles-with-partial-arrays

Unit test on Geometry and measurement
https://www.khanacademy.org/math/in-in-class-4th-math-cbse/x37a2a840963ae149:geometry-and-measurement/x37a2a840963ae149:area/t/x37a2a840963ae149:geometry-and-measurement-unit-test