Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 166 · 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. 1.10 + 9 =
2. 2.Best estimate of 22 × 28? (a) 60 (b) 6000 (c) 600
3. 3.120 ÷ 8 =
4. 4.35 + ? = 100
5. 5.15 + 6 =
6. 6.13² =
7. 7.32 + 34 =
8. 8.Half of 86 =
9. 9.49 + 19 =
10. 10.28 + 53 =
11. 11.7 + 6 =
12. 12.42 + 12 =
13. 13.33 − 19 =
14. 14.25² =
15. 15.83 − 59 =
16. 16.You start your homework at 7:55 and finish at 9:35. How many minutes did you work?
17. 17.423 ÷ 9 =
18. 18.21 × 8 =
19. 19.Double 86 =
20. 20.24 + 26 =
21. 21.Double 63 =
22. 22.67 + 6 =
23. 23.25% of ₹470 =
24. 24.106 − 78 =
25. 25.Best estimate of 311 + 393? (a) 500 (b) 700 (c) 900
26. 26.20 × 8 =
27. 27.15 + 7 =
28. 28.220 ÷ 5 =
29. 29.You start your homework at 5:40 and finish at 6:05. How many minutes did you work?
30. 30.A film starts at 8:10 and ends at 8:55. How many minutes long is the film?
31. 31.6 + 5 =
32. 32.9 + 10 =
33. 33.48 + 3 =
34. 34.43 − 9 =
35. 35.61 laddoos are packed in boxes of 5. How many laddoos are left over?
36. 36.You start your homework at 7:05 and finish at 9:10. How many minutes did you work?
37. 37.58 × 4 =
38. 38.A film starts at 4:35 and ends at 6:25. How many minutes long is the film?
39. 39.204 − 185 =
40. 40.8 + 9 =

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