Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 431 · 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. 1.280 ÷ 8 =
2. 2.Best estimate of 445 + 783? (a) 1400 (b) 1000 (c) 1200
3. 3.26 + 19 =
4. 4.20 + 21 =
5. 5.47 + 89 =
6. 6.89 + ? = 100
7. 7.You buy a kite for ₹25 and pay with a ₹100 note. How much change do you get, in rupees?
8. 8.You buy a bag of mangoes for ₹44 and a pen for ₹45. You pay with a ₹100 note. How much change do you get, in rupees?
9. 9.31 × 9 =
10. 10.You buy a kite for ₹18 and a pen for ₹21. You pay with a ₹100 note. How much change do you get, in rupees?
11. 11.125 − 83 =
12. 12.64 + 83 =
13. 13.21² =
14. 14.38 children stand in rows of 3. How many full rows can they make?
15. 15.21 + 22 =
16. 16.Best estimate of 64 × 90? (a) 5400 (b) 540 (c) 54000
17. 17.60 − 21 =
18. 18.63 − 31 =
19. 19.51 × 4 =
20. 20.11 + 12 =
21. 21.132 ÷ 4 =
22. 22.62 − 38 =
23. 23.156 ÷ 4 =
24. 24.76 + ? = 100
25. 25.114 − 81 =
26. 26.23 + 29 =
27. 27.25% of ₹700 =
28. 28.47 × 4 =
29. 29.10 + 9 =
30. 30.Half of 26 =
31. 31.51 × 8 =
32. 32.24² =
33. 33.Double 18 =
34. 34.30 × 8 =
35. 35.Best estimate of 770 + 711? (a) 1700 (b) 1300 (c) 1500
36. 36.Double 93 =
37. 37.304 ÷ 8 =
38. 38.208 ÷ 8 =
39. 39.62 + 19 =
40. 40.17² =

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