Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 280 · 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. 1.66 laddoos are packed in boxes of 7. How many laddoos are left over?
2. 2.51 × 7 =
3. 3.Half of 78 =
4. 4.17 + 8 =
5. 5.42 + 44 =
6. 6.51 laddoos are packed in boxes of 7. How many laddoos are left over?
7. 7.18² =
8. 8.10% of ₹270 =
9. 9.41 + ? = 100
10. 10.16² =
11. 11.48 ÷ 4 =
12. 12.83 − 19 =
13. 13.23 + 29 =
14. 14.308 − 277 =
15. 15.12 × 4 =
16. 16.98 × 3 =
17. 17.You buy a water bottle for ₹47 and pay with a ₹100 note. How much change do you get, in rupees?
18. 18.82 × 3 =
19. 19.22 + 21 =
20. 20.21 + ? = 100
21. 21.85 + ? = 100
22. 22.6 + 7 =
23. 23.You buy a water bottle for ₹161 and pay with a ₹500 note. How much change do you get, in rupees?
24. 24.56 + ? = 100
25. 25.78 − 66 =
26. 26.681 − 99 =
27. 27.258 ÷ 6 =
28. 28.Half of 88 =
29. 29.You buy a box of crayons for ₹45 and a pen for ₹11. You pay with a ₹100 note. How much change do you get, in rupees?
30. 30.1002 − 981 =
31. 31.9 + ? = 10
32. 32.26² =
33. 33.73 − 28 =
34. 34.43 + 29 =
35. 35.44 + 29 =
36. 36.What is the remainder when 42 is divided by 9?
37. 37.502 − 486 =
38. 38.78 ÷ 6 =
39. 39.33 + 19 =
40. 40.Best estimate of 73 × 66? (a) 4900 (b) 490 (c) 49000

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