Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 662 · 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. 1.55 − 18 =
2. 2.5 + ? = 10
3. 3.248 ÷ 8 =
4. 4.15 + 16 =
5. 5.Best estimate of 22 × 42? (a) 80 (b) 8000 (c) 800
6. 6.12 + 13 =
7. 7.314 − 288 =
8. 8.Best estimate of 411 + 220? (a) 800 (b) 400 (c) 600
9. 9.You buy a pencil box for ₹20 and a pen for ₹16. You pay with a ₹100 note. How much change do you get, in rupees?
10. 10.70 − 37 =
11. 11.25% of ₹540 =
12. 12.You buy a box of crayons for ₹43 and a pen for ₹35. You pay with a ₹100 note. How much change do you get, in rupees?
13. 13.455 − 99 =
14. 14.You buy a water bottle for ₹45 and pay with a ₹100 note. How much change do you get, in rupees?
15. 15.567 ÷ 9 =
16. 16.Best estimate of 362 + 453? (a) 700 (b) 1100 (c) 900
17. 17.Best estimate of 880 + 290? (a) 1000 (b) 1200 (c) 1400
18. 18.45 + 9 =
19. 19.5% of ₹420 =
20. 20.492 + 99 =
21. 21.67 + 8 =
22. 22.50% of ₹780 =
23. 23.12 + 14 =
24. 24.16 × 8 =
25. 25.160 ÷ 4 =
26. 26.50% of ₹370 =
27. 27.292 ÷ 4 =
28. 28.144 ÷ 4 =
29. 29.You buy a water bottle for ₹42 and a pen for ₹41. You pay with a ₹100 note. How much change do you get, in rupees?
30. 30.101 − 29 =
31. 31.51 − 33 =
32. 32.67 + ? = 100
33. 33.72 × 3 =
34. 34.53 − 41 =
35. 35.You buy a box of crayons for ₹71 and pay with a ₹100 note. How much change do you get, in rupees?
36. 36.10% of ₹200 =
37. 37.7 + 6 =
38. 38.A film starts at 5:05 and ends at 5:55. How many minutes long is the film?
39. 39.52 − 9 =
40. 40.34 + 65 =

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths