Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 673 · 40 questions

How to do it in your head (Look first): A 9, 19 or 99 → round and adjust. Two close numbers → count up (or near doubles when adding). × or ÷ by 4 or 8 → double or halve; other sums → split into tens and ones.

1. 1.23² =
2. 2.9 + 9 =
3. 3.40 + 73 =
4. 4.92 ÷ 4 =
5. 5.64 + 34 =
6. 6.16 × 8 =
7. 7.Best estimate of 31 × 70? (a) 21000 (b) 2100 (c) 210
8. 8.Double 99 =
9. 9.59 − 35 =
10. 10.60 ÷ 5 =
11. 11.19 + 18 =
12. 12.35 + 6 =
13. 13.22² =
14. 14.You buy a box of crayons for ₹487 and pay with a ₹500 note. How much change do you get, in rupees?
15. 15.89 + ? = 100
16. 16.71 × 7 =
17. 17.27 + 4 =
18. 18.28 + ? = 100
19. 19.45 × 9 =
20. 20.47 laddoos are packed in boxes of 3. How many laddoos are left over?
21. 21.46 children stand in rows of 5. How many full rows can they make?
22. 22.220 ÷ 4 =
23. 23.29² =
24. 24.43 + ? = 100
25. 25.23 + 24 =
26. 26.107 + 99 =
27. 27.Best estimate of 17 × 21? (a) 400 (b) 4000 (c) 40
28. 28.62 + 75 =
29. 29.You buy a bag of mangoes for ₹220 and pay with a ₹500 note. How much change do you get, in rupees?
30. 30.208 ÷ 8 =
31. 31.Best estimate of 573 + 264? (a) 900 (b) 1100 (c) 700
32. 32.19 + 20 =
33. 33.32 + ? = 100
34. 34.25 × 4 =
35. 35.488 ÷ 8 =
36. 36.16 + 15 =
37. 37.86 + 51 =
38. 38.13 + 12 =
39. 39.63 − 17 =
40. 40.A film starts at 7:10 and ends at 7:40. How many minutes long is the film?

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