Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 455 · 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. 1.15 × 4 =
2. 2.10 + 12 =
3. 3.Best estimate of 329 + 165? (a) 500 (b) 700 (c) 300
4. 4.19 + 2 =
5. 5.20 + 19 =
6. 6.79 × 7 =
7. 7.107 − 85 =
8. 8.192 ÷ 8 =
9. 9.29 + 59 =
10. 10.75 + 9 =
11. 11.322 ÷ 7 =
12. 12.1 + ? = 10
13. 13.35 × 6 =
14. 14.70 + ? = 100
15. 15.7 + ? = 10
16. 16.Best estimate of 12 × 49? (a) 5000 (b) 50 (c) 500
17. 17.48 + 6 =
18. 18.84 ÷ 4 =
19. 19.258 ÷ 3 =
20. 20.56 + 9 =
21. 21.You buy a kite for ₹376 and pay with a ₹500 note. How much change do you get, in rupees?
22. 22.57 − 46 =
23. 23.Best estimate of 76 × 56? (a) 480 (b) 48000 (c) 4800
24. 24.216 ÷ 4 =
25. 25.55 + 57 =
26. 26.A train leaves at 8:25 and reaches the next city at 10:05. How many minutes is the journey?
27. 27.30 × 4 =
28. 28.154 ÷ 7 =
29. 29.Half of 152 =
30. 30.54 − 19 =
31. 31.Double 16 =
32. 32.44 × 4 =
33. 33.34 + ? = 100
34. 34.13 laddoos are packed in boxes of 3. How many laddoos are left over?
35. 35.37 + 49 =
36. 36.You buy a kite for ₹12 and a pen for ₹45. You pay with a ₹100 note. How much change do you get, in rupees?
37. 37.30 − 9 =
38. 38.7 + 9 =
39. 39.49 laddoos are packed in boxes of 4. How many laddoos are left over?
40. 40.85 + 45 =

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