Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 187 · 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. 1.18 + 20 =
2. 2.212 ÷ 4 =
3. 3.39 × 8 =
4. 4.59 + ? = 100
5. 5.62 + ? = 100
6. 6.11 + 12 =
7. 7.Best estimate of 18 × 36? (a) 800 (b) 8000 (c) 80
8. 8.Double 72 =
9. 9.84 − 14 =
10. 10.75 − 28 =
11. 11.30 + 56 =
12. 12.35 + 24 =
13. 13.Double 32 =
14. 14.17² =
15. 15.Best estimate of 615 + 197? (a) 1000 (b) 600 (c) 800
16. 16.68 − 39 =
17. 17.87 − 65 =
18. 18.838 − 99 =
19. 19.46 + 36 =
20. 20.307 + 99 =
21. 21.92 ÷ 4 =
22. 22.60 − 46 =
23. 23.32 + ? = 100
24. 24.37 − 29 =
25. 25.25 + 24 =
26. 26.A cricket match starts at 1:00 and the first innings ends at 2:25. How many minutes did the innings last?
27. 27.68 + 45 =
28. 28.58 + 25 =
29. 29.8 + ? = 10
30. 30.384 ÷ 8 =
31. 31.You buy a cricket ball for ₹87 and pay with a ₹100 note. How much change do you get, in rupees?
32. 32.42 − 19 =
33. 33.68 − 30 =
34. 34.You start your homework at 1:35 and finish at 4:40. How many minutes did you work?
35. 35.40 laddoos are packed in boxes of 3. How many laddoos are left over?
36. 36.Double 49 =
37. 37.18² =
38. 38.A cricket match starts at 3:55 and the first innings ends at 4:30. How many minutes did the innings last?
39. 39.10% of ₹380 =
40. 40.66 − 9 =

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