Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 136 · 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. 1.29 × 3 =
2. 2.71 + 55 =
3. 3.118 + 99 =
4. 4.71 × 6 =
5. 5.67 + 61 =
6. 6.87 + 7 =
7. 7.22 + 24 =
8. 8.574 − 99 =
9. 9.89 − 21 =
10. 10.You buy a pencil box for ₹29 and a pen for ₹43. You pay with a ₹100 note. How much change do you get, in rupees?
11. 11.17 laddoos are packed in boxes of 3. How many laddoos are left over?
12. 12.54 − 16 =
13. 13.3 + ? = 10
14. 14.15 + ? = 100
15. 15.Double 21 =
16. 16.315 − 277 =
17. 17.A train leaves at 8:45 and reaches the next city at 9:25. How many minutes is the journey?
18. 18.15² =
19. 19.58 − 28 =
20. 20.7 + 8 =
21. 21.48 + 87 =
22. 22.17² =
23. 23.Best estimate of 397 + 857? (a) 1300 (b) 1500 (c) 1100
24. 24.61 − 42 =
25. 25.You buy a cricket ball for ₹406 and pay with a ₹500 note. How much change do you get, in rupees?
26. 26.68 + 6 =
27. 27.You start your homework at 2:35 and finish at 3:30. How many minutes did you work?
28. 28.10 + 9 =
29. 29.57 + 12 =
30. 30.21 × 9 =
31. 31.176 ÷ 8 =
32. 32.43 × 3 =
33. 33.801 ÷ 9 =
34. 34.168 ÷ 4 =
35. 35.53 − 33 =
36. 36.1008 − 975 =
37. 37.16 children stand in rows of 3. How many full rows can they make?
38. 38.2 + ? = 10
39. 39.87 + 5 =
40. 40.8 + 10 =

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