Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 358 · 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. 1.44 + ? = 100
2. 2.8 + 7 =
3. 3.25² =
4. 4.81 × 4 =
5. 5.You buy a kite for ₹410 and pay with a ₹500 note. How much change do you get, in rupees?
6. 6.Best estimate of 61 × 88? (a) 5400 (b) 54000 (c) 540
7. 7.Best estimate of 582 + 874? (a) 1300 (b) 1500 (c) 1700
8. 8.12 + 14 =
9. 9.486 + 99 =
10. 10.You buy a water bottle for ₹24 and a pen for ₹39. You pay with a ₹100 note. How much change do you get, in rupees?
11. 11.306 + 99 =
12. 12.Best estimate of 38 × 36? (a) 160 (b) 16000 (c) 1600
13. 13.A cricket match starts at 4:25 and the first innings ends at 4:50. How many minutes did the innings last?
14. 14.What is the remainder when 38 is divided by 8?
15. 15.Double 95 =
16. 16.17 × 8 =
17. 17.You buy a box of crayons for ₹21 and a pen for ₹39. You pay with a ₹100 note. How much change do you get, in rupees?
18. 18.90 − 51 =
19. 19.86 − 24 =
20. 20.Best estimate of 70 × 39? (a) 2800 (b) 28000 (c) 280
21. 21.182 ÷ 7 =
22. 22.176 ÷ 8 =
23. 23.50% of ₹110 =
24. 24.41 × 4 =
25. 25.77 + 29 =
26. 26.76 + 7 =
27. 27.Best estimate of 26 × 46? (a) 1500 (b) 15000 (c) 150
28. 28.79 + 32 =
29. 29.21² =
30. 30.Best estimate of 90 × 74? (a) 6300 (b) 63000 (c) 630
31. 31.92 − 82 =
32. 32.Best estimate of 404 + 777? (a) 1200 (b) 1000 (c) 1400
33. 33.66 + ? = 100
34. 34.25% of ₹570 =
35. 35.13 + 15 =
36. 36.21 + 85 =
37. 37.9 + 4 =
38. 38.63 + 48 =
39. 39.20 + 19 =
40. 40.Half of 48 =

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