Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 311 · 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.Best estimate of 51 × 16? (a) 100 (b) 10000 (c) 1000
2. 2.Double 18 =
3. 3.65 + 6 =
4. 4.Double 71 =
5. 5.21 + 20 =
6. 6.40 + 45 =
7. 7.Best estimate of 870 + 198? (a) 1100 (b) 1300 (c) 900
8. 8.You buy a pencil box for ₹27 and a pen for ₹42. You pay with a ₹100 note. How much change do you get, in rupees?
9. 9.Best estimate of 43 × 56? (a) 2400 (b) 24000 (c) 240
10. 10.25% of ₹510 =
11. 11.Best estimate of 64 × 79? (a) 480 (b) 48000 (c) 4800
12. 12.81 − 64 =
13. 13.98 − 48 =
14. 14.Half of 44 =
15. 15.54 − 36 =
16. 16.10% of ₹570 =
17. 17.17² =
18. 18.314 − 290 =
19. 19.Best estimate of 17 × 19? (a) 4000 (b) 40 (c) 400
20. 20.306 ÷ 6 =
21. 21.15 × 4 =
22. 22.64 + 26 =
23. 23.You buy a storybook for ₹62 and pay with a ₹100 note. How much change do you get, in rupees?
24. 24.19² =
25. 25.25% of ₹840 =
26. 26.40 × 8 =
27. 27.64 + 65 =
28. 28.63 + 29 =
29. 29.497 ÷ 7 =
30. 30.22² =
31. 31.168 ÷ 8 =
32. 32.65 − 19 =
33. 33.33 + 48 =
34. 34.29 × 4 =
35. 35.57 + ? = 100
36. 36.22 × 8 =
37. 37.6 + ? = 10
38. 38.A film starts at 4:45 and ends at 5:50. How many minutes long is the film?
39. 39.19 + 29 =
40. 40.24 + 61 =

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