Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 862 · 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 ₹140 =
2. 2.221 − 198 =
3. 3.65 − 21 =
4. 4.3 + ? = 10
5. 5.64 − 47 =
6. 6.164 ÷ 4 =
7. 7.Best estimate of 21 × 20? (a) 4000 (b) 40 (c) 400
8. 8.70 − 29 =
9. 9.60 ÷ 4 =
10. 10.84 − 19 =
11. 11.49 + 9 =
12. 12.4 + ? = 10
13. 13.91 − 68 =
14. 14.65 − 32 =
15. 15.144 ÷ 4 =
16. 16.25 + 24 =
17. 17.Best estimate of 398 + 637? (a) 1000 (b) 1200 (c) 800
18. 18.A train leaves at 6:35 and reaches the next city at 7:00. How many minutes is the journey?
19. 19.Best estimate of 669 + 269? (a) 1000 (b) 800 (c) 1200
20. 20.1006 − 978 =
21. 21.47 + 15 =
22. 22.What is the remainder when 34 is divided by 5?
23. 23.84 − 67 =
24. 24.20 + 22 =
25. 25.256 ÷ 8 =
26. 26.1003 − 997 =
27. 27.2 + ? = 10
28. 28.16 + 8 =
29. 29.94 − 67 =
30. 30.Best estimate of 706 + 510? (a) 1200 (b) 1400 (c) 1000
31. 31.89 + 62 =
32. 32.77 × 3 =
33. 33.You buy a pencil box for ₹32 and a pen for ₹16. You pay with a ₹100 note. How much change do you get, in rupees?
34. 34.21 − 9 =
35. 35.53 × 4 =
36. 36.59 − 42 =
37. 37.Best estimate of 48 × 22? (a) 10000 (b) 1000 (c) 100
38. 38.71 + ? = 100
39. 39.75 × 9 =
40. 40.23 × 7 =

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