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🧮 20-question Class 8 maths quiz

Maths quiz for Class 8: 20 questions with instant answers

Test your Class 8 maths: squares and roots, exponents, cube roots, compound interest, Pythagoras and probability. Tap an answer to see at once whether you are right, read the explanation and see your score at the end. The questions change in the same way as a worksheet, so replay for more.

Updated 21 October 2026. Every question is checked and every answer is explained.

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How to play

  • Use paper for the longer ones and do not guess.
  • Read the explanation after every answer.
  • Take it again after a week and try to beat your score.

Question 1 of 20

See all 20 questions and answers
  1. Work out: √400 20. The answer is 20. Ask yourself: which number multiplied by itself gives this? Learn the squares up to 15².
  2. Fill in the blank: (8^4)^4 = 8^___ 16. The answer is 16. Same base: multiply means add the powers, divide means subtract, and a power of a power means multiply.
  3. The cube root of 2744 is … 14. The answer is 14.
  4. A right triangle has legs of 8 and 15. The hypotenuse is … 17. The answer is 17. The hypotenuse is always the longest side, opposite the right angle. Square the sides, add them, then square root.
  5. Find the compound interest on ₹1,000 for 2 years at 10% per year, compounded yearly. (in ₹) 210. The answer is 210.
  6. Fill in the blank: 1,100,000,000 = 1.1 × 10^___ 9. The answer is 9. Move the decimal point until there is one non-zero digit in front, and count the moves.
  7. A bag has 6 red, 1 blue and 1 green balls. One ball is drawn at random. The probability that it is blue is … 1/8. The answer is 1/8.
  8. Work out: (3/4)^−1 4/3. The answer is 4/3.
  9. Work out: √100 10. The answer is 10. Ask yourself: which number multiplied by itself gives this? Learn the squares up to 15².
  10. Fill in the blank: 5^8 ÷ 5^6 = 5^___ 2. The answer is 2. Same base: multiply means add the powers, divide means subtract, and a power of a power means multiply.
  11. The cube root of 729 is … 9. The answer is 9.
  12. A right triangle has legs of 40 and 42. The hypotenuse is … 58. The answer is 58. The hypotenuse is always the longest side, opposite the right angle. Square the sides, add them, then square root.
  13. Find the amount on ₹6,000 for 2 years at 10% per year, compounded yearly. (in ₹) 7260. The answer is 7260.
  14. Fill in the blank: 1,100,000 = 1.1 × 10^___ 6. The answer is 6. Move the decimal point until there is one non-zero digit in front, and count the moves.
  15. A fair die is rolled once. The probability of getting a number greater than 4 is … 1/3. The answer is 1/3.
  16. Work out: 2^−4 1/16. The answer is 1/16.
  17. Work out: √196 14. The answer is 14. Ask yourself: which number multiplied by itself gives this? Learn the squares up to 15².
  18. Fill in the blank: (8^3)^4 = 8^___ 12. The answer is 12. Same base: multiply means add the powers, divide means subtract, and a power of a power means multiply.
  19. Work out: 7³ 343. The answer is 343.
  20. A right triangle has legs of 7 and 24. The hypotenuse is … 25. The answer is 25. The hypotenuse is always the longest side, opposite the right angle. Square the sides, add them, then square root.

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FAQ

Maths quiz for Class 8: questions people ask

What does the Class 8 maths quiz cover?

It covers squares and roots, exponents, cube roots, compound interest, Pythagoras and probability. Chapter names and order differ by board and textbook, so use it alongside your own book.

Are the answers correct?

Yes. Every question is made by code that also works out the answer, and automated tests check the questions and answers.

Can I print it?

The quiz runs on screen. For a printable sheet with an answer key use our free worksheets.

What should I practise next?

Open the maths topic pages for notes, solved examples and more practice questions.

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