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Class 8 Maths Practice Test: Exponents and Powers - Comparing Very Small and Large Numbers
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Avg score: 62% • Most missed: “Compare volumes of cube A having side 2 × 102 m and cube B having side 1 × 101 m…”

Before comparing very large or small numbers, convert them to their standard exponential form and then divide them.
If two numbers in standard form have the same power of 10, then the number with the larger factor is greater.
For example, 8.72 × 1024 < 9.4326 × 1024

Class 8 Maths Practice Test: Exponents and Powers - Comparing Very Small and Large Numbers
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5 Questions

1. Compare the radius of circle P (r1 = 10.2 × 10-6) with the radius of circle B (r1 = 0.2 × 10-5).
2. Mass of object A is 120000 and that of B is 0.240. Compare their masses.
3. Compare volumes of cube A having side 2 × 102 m and cube B having side 1 × 101 m.
4. Mass of a neutron is 1.675 × 10-27 and mass of proton is 1.672 × 10-27. Find the total mass.
5. Distance between A to C is 2.1 × 1011 and that of A to B is 3.12 × 109. Find the distance between B and C.

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