Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 718 · 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 + 17 =
2. 2.25 × 4 =
3. 3.78 − 19 =
4. 4.Best estimate of 20 × 80? (a) 1600 (b) 160 (c) 16000
5. 5.You buy a bag of mangoes for ₹280 and pay with a ₹500 note. How much change do you get, in rupees?
6. 6.56 × 3 =
7. 7.78 − 30 =
8. 8.20 + ? = 100
9. 9.227 − 193 =
10. 10.Best estimate of 21 × 73? (a) 1400 (b) 14000 (c) 140
11. 11.A train leaves at 8:50 and reaches the next city at 11:05. How many minutes is the journey?
12. 12.Double 69 =
13. 13.793 + 99 =
14. 14.52 − 29 =
15. 15.22 + 45 =
16. 16.52 − 41 =
17. 17.71 + ? = 100
18. 18.50% of ₹230 =
19. 19.53 + 9 =
20. 20.21 × 8 =
21. 21.Best estimate of 13 × 20? (a) 200 (b) 2000 (c) 20
22. 22.65 + 6 =
23. 23.12² =
24. 24.5 + 9 =
25. 25.10% of ₹390 =
26. 26.176 ÷ 8 =
27. 27.Best estimate of 43 × 14? (a) 400 (b) 40 (c) 4000
28. 28.62 × 9 =
29. 29.160 ÷ 4 =
30. 30.29 + 28 =
31. 31.60 − 18 =
32. 32.Half of 98 =
33. 33.82 × 7 =
34. 34.You buy a pencil box for ₹62 and pay with a ₹100 note. How much change do you get, in rupees?
35. 35.90 − 73 =
36. 36.69 + 9 =
37. 37.A film starts at 7:10 and ends at 10:05. How many minutes long is the film?
38. 38.40 × 8 =
39. 39.15 + ? = 100
40. 40.32 + 48 =

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