Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 87 · 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. 1.35 × 4 =
2. 2.47 × 4 =
3. 3.28² =
4. 4.9 + ? = 10
5. 5.40 + 83 =
6. 6.17 − 9 =
7. 7.25 × 4 =
8. 8.You start your homework at 3:35 and finish at 5:05. How many minutes did you work?
9. 9.680 ÷ 8 =
10. 10.13 + 14 =
11. 11.21 × 4 =
12. 12.16² =
13. 13.Best estimate of 640 + 848? (a) 1600 (b) 1200 (c) 1400
14. 14.84 + 15 =
15. 15.A film starts at 3:45 and ends at 6:30. How many minutes long is the film?
16. 16.39 + 2 =
17. 17.33 + 26 =
18. 18.230 − 187 =
19. 19.66 − 9 =
20. 20.55 − 9 =
21. 21.68 + 9 =
22. 22.You buy a storybook for ₹24 and pay with a ₹100 note. How much change do you get, in rupees?
23. 23.26 + 5 =
24. 24.75 + ? = 100
25. 25.Double 93 =
26. 26.50% of ₹620 =
27. 27.Double 18 =
28. 28.15 + 8 =
29. 29.192 ÷ 4 =
30. 30.75 − 59 =
31. 31.325 − 282 =
32. 32.82 laddoos are packed in boxes of 9. How many laddoos are left over?
33. 33.A train leaves at 1:30 and reaches the next city at 4:45. How many minutes is the journey?
34. 34.You start your homework at 2:40 and finish at 4:00. How many minutes did you work?
35. 35.573 + 99 =
36. 36.19 + 20 =
37. 37.225 − 197 =
38. 38.Best estimate of 147 + 262? (a) 600 (b) 200 (c) 400
39. 39.25 + 8 =
40. 40.19² =

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