Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 599 · 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 + 12 =
2. 2.17 × 8 =
3. 3.192 ÷ 4 =
4. 4.Best estimate of 42 × 26? (a) 1200 (b) 12000 (c) 120
5. 5.14² =
6. 6.75 + 9 =
7. 7.81 − 9 =
8. 8.37 × 5 =
9. 9.You buy a storybook for ₹93 and pay with a ₹100 note. How much change do you get, in rupees?
10. 10.176 ÷ 4 =
11. 11.Best estimate of 82 × 89? (a) 7200 (b) 720 (c) 72000
12. 12.19 + 4 =
13. 13.85 + 6 =
14. 14.50 children stand in rows of 6. How many full rows can they make?
15. 15.64 − 17 =
16. 16.Best estimate of 868 + 179? (a) 1300 (b) 1100 (c) 900
17. 17.842 − 99 =
18. 18.87 − 19 =
19. 19.Best estimate of 36 × 86? (a) 36000 (b) 360 (c) 3600
20. 20.Half of 186 =
21. 21.20 + 21 =
22. 22.16 + 6 =
23. 23.72 ÷ 3 =
24. 24.272 ÷ 8 =
25. 25.232 ÷ 4 =
26. 26.510 − 497 =
27. 27.You start your homework at 7:30 and finish at 10:40. How many minutes did you work?
28. 28.44 × 9 =
29. 29.256 ÷ 8 =
30. 30.73 × 8 =
31. 31.75 − 62 =
32. 32.Best estimate of 51 × 48? (a) 250 (b) 2500 (c) 25000
33. 33.54 × 4 =
34. 34.5% of ₹250 =
35. 35.83 + ? = 100
36. 36.A cricket match starts at 5:35 and the first innings ends at 6:45. How many minutes did the innings last?
37. 37.42 + 71 =
38. 38.You start your homework at 2:50 and finish at 5:50. How many minutes did you work?
39. 39.19 + 19 =
40. 40.801 ÷ 9 =

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