Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 949 · 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.Best estimate of 91 × 62? (a) 54000 (b) 5400 (c) 540
2. 2.8 + ? = 10
3. 3.365 − 99 =
4. 4.10% of ₹490 =
5. 5.23 + 56 =
6. 6.312 ÷ 4 =
7. 7.Best estimate of 138 + 683? (a) 800 (b) 600 (c) 1000
8. 8.120 ÷ 5 =
9. 9.59 + 2 =
10. 10.Half of 176 =
11. 11.77 × 4 =
12. 12.507 − 494 =
13. 13.25 + 8 =
14. 14.21 + 23 =
15. 15.A cricket match starts at 1:45 and the first innings ends at 2:45. How many minutes did the innings last?
16. 16.312 ÷ 6 =
17. 17.203 − 197 =
18. 18.21 × 4 =
19. 19.77 + ? = 100
20. 20.You buy a pencil box for ₹37 and pay with a ₹100 note. How much change do you get, in rupees?
21. 21.You buy a kite for ₹19 and pay with a ₹100 note. How much change do you get, in rupees?
22. 22.26 + 25 =
23. 23.Double 95 =
24. 24.30 + ? = 100
25. 25.164 ÷ 4 =
26. 26.27 + 6 =
27. 27.1016 − 977 =
28. 28.Best estimate of 67 × 73? (a) 490 (b) 4900 (c) 49000
29. 29.78 − 15 =
30. 30.505 − 494 =
31. 31.88 − 29 =
32. 32.74 × 4 =
33. 33.84 − 9 =
34. 34.Best estimate of 380 + 267? (a) 500 (b) 700 (c) 900
35. 35.71 + ? = 100
36. 36.86 − 19 =
37. 37.32 × 6 =
38. 38.37 + 8 =
39. 39.21 + 22 =
40. 40.21² =

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