Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 354 · 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 + 9 =
2. 2.You buy a cricket ball for ₹15 and pay with a ₹100 note. How much change do you get, in rupees?
3. 3.52 − 41 =
4. 4.63 − 30 =
5. 5.59 − 22 =
6. 6.Best estimate of 93 × 22? (a) 1800 (b) 180 (c) 18000
7. 7.You buy a water bottle for ₹201 and pay with a ₹500 note. How much change do you get, in rupees?
8. 8.91 − 71 =
9. 9.Best estimate of 669 + 595? (a) 1500 (b) 1300 (c) 1100
10. 10.22 + 34 =
11. 11.27 + 4 =
12. 12.Best estimate of 351 + 684? (a) 1100 (b) 900 (c) 1300
13. 13.68 + 51 =
14. 14.26 + 28 =
15. 15.60 × 4 =
16. 16.236 ÷ 4 =
17. 17.Best estimate of 837 + 780? (a) 1600 (b) 1800 (c) 1400
18. 18.50% of ₹120 =
19. 19.77 + 5 =
20. 20.271 + 99 =
21. 21.43 × 4 =
22. 22.85 + 9 =
23. 23.Half of 46 =
24. 24.86 + 6 =
25. 25.You buy a kite for ₹31 and pay with a ₹100 note. How much change do you get, in rupees?
26. 26.70 − 22 =
27. 27.514 − 477 =
28. 28.111 − 89 =
29. 29.512 − 491 =
30. 30.57 + 6 =
31. 31.10% of ₹700 =
32. 32.3 + ? = 10
33. 33.50% of ₹170 =
34. 34.80 + 81 =
35. 35.212 ÷ 4 =
36. 36.Best estimate of 563 + 316? (a) 900 (b) 700 (c) 1100
37. 37.Best estimate of 62 × 24? (a) 12000 (b) 1200 (c) 120
38. 38.50% of ₹160 =
39. 39.23 × 4 =
40. 40.10% of ₹190 =

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