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Class 8 Power Play worksheet
CBSE Mathematics. Laws of exponents, negative powers, standard form. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
3⁻³ is equal to:
- 27
- −27
- −1/27
- 1/27
Answer
(d) 1/27
3⁻³ = 1/3³ = 1/27
- 2.
9⁹ × 9⁵ equals:
- 81¹⁴
- 9⁴
- 9¹⁴
- 9⁴⁵
Answer
(c) 9¹⁴
add the powers: 9 + 5 = 14
- 3.
(3⁻²)⁻⁴ equals:
- 3²
- 3⁻⁶
- 3⁸
- 9⁸
Answer
(c) 3⁸
multiply the powers: −2 × (−4) = 8
Section B · short answer
- 4.
Find the value of (3⁻¹ + 8⁻¹)⁻¹.
Answer
24/11
1/3 + 1/8 = 11/24; its reciprocal is 24/11
- 5.
Simplify: (9³ × 9⁻⁷) ÷ 9⁹
Answer
9⁻¹³
3 − 7 − 9 = −13
Section C · long answer
- 6.
The distance from a planet to its moon is about 74,500,000,000 km. Write this number in standard form.
Answer
7.45 × 10¹⁰
74,500,000,000 = 7.45 × 10¹⁰
Fresh sheets for your child
In the app, every Power Play sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
Coming soon for Android and iPhone.