Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 485 · 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. 1.5% of ₹770 =
2. 2.37 + 19 =
3. 3.54 − 34 =
4. 4.Best estimate of 146 + 124? (a) 400 (b) 0 (c) 200
5. 5.Half of 150 =
6. 6.68 × 9 =
7. 7.Half of 48 =
8. 8.34 × 4 =
9. 9.10% of ₹390 =
10. 10.12 + 19 =
11. 11.25 × 8 =
12. 12.42 children stand in rows of 5. How many full rows can they make?
13. 13.518 ÷ 7 =
14. 14.13 + ? = 100
15. 15.26 × 3 =
16. 16.23 + 24 =
17. 17.Best estimate of 24 × 76? (a) 16000 (b) 160 (c) 1600
18. 18.1009 − 981 =
19. 19.125 − 98 =
20. 20.67 + ? = 100
21. 21.Double 81 =
22. 22.10 + 11 =
23. 23.51 + 9 =
24. 24.You start your homework at 8:40 and finish at 10:35. How many minutes did you work?
25. 25.67 + 71 =
26. 26.112 ÷ 8 =
27. 27.14 × 7 =
28. 28.You buy a pencil box for ₹25 and a pen for ₹12. You pay with a ₹100 note. How much change do you get, in rupees?
29. 29.Double 24 =
30. 30.87 − 23 =
31. 31.A film starts at 5:45 and ends at 7:25. How many minutes long is the film?
32. 32.17 × 8 =
33. 33.25% of ₹650 =
34. 34.A train leaves at 3:50 and reaches the next city at 5:15. How many minutes is the journey?
35. 35.25² =
36. 36.18 + 17 =
37. 37.12 × 8 =
38. 38.You buy a water bottle for ₹320 and pay with a ₹500 note. How much change do you get, in rupees?
39. 39.11 + 12 =
40. 40.25% of ₹780 =

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