Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 498 · 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. 1.39 + 5 =
2. 2.22² =
3. 3.128 ÷ 8 =
4. 4.33 − 29 =
5. 5.39 + 77 =
6. 6.264 ÷ 8 =
7. 7.You buy a box of crayons for ₹68 and pay with a ₹100 note. How much change do you get, in rupees?
8. 8.25 + 6 =
9. 9.Double 92 =
10. 10.20 + ? = 100
11. 11.50% of ₹380 =
12. 12.301 − 284 =
13. 13.13 + ? = 100
14. 14.Best estimate of 96 × 21? (a) 2000 (b) 200 (c) 20000
15. 15.What is the remainder when 83 is divided by 6?
16. 16.10% of ₹740 =
17. 17.87 + ? = 100
18. 18.19 × 4 =
19. 19.Best estimate of 667 + 756? (a) 1700 (b) 1500 (c) 1300
20. 20.80 + 13 =
21. 21.5% of ₹290 =
22. 22.282 ÷ 3 =
23. 23.Double 54 =
24. 24.You buy a water bottle for ₹63 and pay with a ₹100 note. How much change do you get, in rupees?
25. 25.620 + 99 =
26. 26.11² =
27. 27.50% of ₹830 =
28. 28.25 + 19 =
29. 29.You buy a water bottle for ₹369 and pay with a ₹500 note. How much change do you get, in rupees?
30. 30.122 children stand in rows of 8. How many full rows can they make?
31. 31.288 ÷ 8 =
32. 32.760 ÷ 8 =
33. 33.58 − 47 =
34. 34.272 ÷ 8 =
35. 35.10% of ₹140 =
36. 36.85 + 58 =
37. 37.68 − 33 =
38. 38.5 + 7 =
39. 39.81 − 38 =
40. 40.26² =

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