Maths puzzles for kids

20 questions

1. I think of a number and double it. The answer is 12. What number did I think of?Ages 8–10

   Choose from: 6, 10, 14, 24

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   6. Double 6 is 12, because 6 + 6 = 12.

2. What is 15% of 200?Ages 11–14

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   30. 10% of 200 is 20 and 5% is 10, so 15% is 20 + 10 = 30.

3. There are 20 children in a class. Half of them are girls. 4 of the girls are wearing hats. How many girls are not wearing hats?Ages 8–10

   Choose from: 16, 10, 4, 6

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   6. Half of 20 is 10 girls. 10 − 4 girls in hats = 6 girls without hats.

4. Three numbers in a row (like 4, 5, 6) add up to 72. What is the largest of the three?Ages 11–14

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   25. 72 ÷ 3 = 24 is the middle number, so the three numbers are 23, 24 and 25.

5. What is 45 + 25?Ages 8–10

   Choose from: 70, 75, 65, 60

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   70. 45 + 25 = 70.

6. What is the square root of 169?Ages 11–14

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   13. 13 × 13 = 169.

7. 2 pencils cost ₹10. How much do 4 pencils cost?Ages 8–10

   Choose from: ₹20, ₹40, ₹12, ₹14

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   ₹20. 4 pencils is double 2 pencils, so double ₹10 = ₹20.

8. What is the sum of the angles inside a quadrilateral?Ages 11–14

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   360°. A quadrilateral splits into two triangles: 2 × 180° = 360°.

9. What is one quarter of 20?Ages 8–10

   Choose from: 80, 4, 10, 5

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   5. A quarter means 1 of 4 equal parts: 20 ÷ 4 = 5.

10. A book costs ₹240 after a 20% discount. What was the original price?Ages 11–14

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    ₹300. ₹240 is 80% of the price, so the price was 240 ÷ 0.8 = ₹300.

11. A rectangle is 6 cm long and 4 cm wide. What is the distance all the way around it?Ages 8–10

    Choose from: 14 cm, 20 cm, 24 cm, 10 cm

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    20 cm. 6 + 4 + 6 + 4 = 20 cm. This is called the perimeter.

12. The ages of a mother and daughter add up to 50. The mother is 4 times as old as the daughter. How old is the daughter?Ages 11–14

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    10. Daughter = d, mother = 4d. 5d = 50, so d = 10.

13. What is 10 × 10?Ages 8–10

    Choose from: 110, 100, 1,000, 20

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    100. 10 × 10 = 100.

14. A rectangle has a perimeter of 30 cm and a length of 10 cm. What is its width?Ages 11–14

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    5 cm. 2 × (10 + w) = 30, so 10 + w = 15 and w = 5 cm.

15. What is 300 + 400?Ages 8–10

    Choose from: 600, 700, 340, 7,000

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    700. 3 hundreds + 4 hundreds = 7 hundreds = 700.

16. What is 50% of 64?Ages 11–14

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    32. 50% is half: 64 ÷ 2 = 32.

17. What is 4 × 6?Ages 8–10

    Choose from: 28, 20, 10, 24

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    24. 4 × 6 = 24.

18. What is 0.3 written as a percentage?Ages 11–14

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    30%. 0.3 × 100 = 30%.

19. What is 64 + 36?Ages 8–10

    Choose from: 110, 98, 100, 90

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    100. 64 + 36 = 100.

20. How many faces does a cube have?Ages 11–14

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    6. A cube has 6 square faces.