Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 278 · 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. 1.31 × 7 =
2. 2.192 ÷ 8 =
3. 3.63 + 32 =
4. 4.27² =
5. 5.36 + 44 =
6. 6.Best estimate of 595 + 210? (a) 1000 (b) 800 (c) 600
7. 7.64 − 24 =
8. 8.98 − 19 =
9. 9.76 − 15 =
10. 10.15 + 14 =
11. 11.9 + ? = 10
12. 12.25 × 8 =
13. 13.34 + 29 =
14. 14.A train leaves at 8:05 and reaches the next city at 8:55. How many minutes is the journey?
15. 15.Best estimate of 59 × 30? (a) 1800 (b) 18000 (c) 180
16. 16.11 + 10 =
17. 17.16 + 5 =
18. 18.35 + 6 =
19. 19.8 + ? = 10
20. 20.29² =
21. 21.42 × 4 =
22. 22.31 + ? = 100
23. 23.You start your homework at 8:10 and finish at 8:40. How many minutes did you work?
24. 24.89 + 9 =
25. 25.58 − 14 =
26. 26.224 ÷ 8 =
27. 27.39 + 9 =
28. 28.You buy a bag of mangoes for ₹48 and pay with a ₹100 note. How much change do you get, in rupees?
29. 29.637 ÷ 7 =
30. 30.86 + 7 =
31. 31.You buy a notebook for ₹481 and pay with a ₹500 note. How much change do you get, in rupees?
32. 32.28² =
33. 33.Best estimate of 286 + 805? (a) 1100 (b) 900 (c) 1300
34. 34.Half of 48 =
35. 35.35 + 8 =
36. 36.37 × 8 =
37. 37.18 + 4 =
38. 38.A film starts at 1:50 and ends at 3:45. How many minutes long is the film?
39. 39.48 ÷ 3 =
40. 40.29 × 4 =

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