Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 317 · 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. 1.26 + 28 =
2. 2.Best estimate of 631 + 639? (a) 1000 (b) 1200 (c) 1400
3. 3.Double 84 =
4. 4.21 + 18 =
5. 5.71 × 5 =
6. 6.Double 91 =
7. 7.27² =
8. 8.25 + 26 =
9. 9.34 × 9 =
10. 10.Best estimate of 804 + 141? (a) 1100 (b) 900 (c) 700
11. 11.You buy a box of crayons for ₹347 and pay with a ₹500 note. How much change do you get, in rupees?
12. 12.148 ÷ 4 =
13. 13.5 + ? = 10
14. 14.53 − 39 =
15. 15.15 + 7 =
16. 16.7 + 8 =
17. 17.1010 − 994 =
18. 18.26 + 27 =
19. 19.25% of ₹380 =
20. 20.11 + 13 =
21. 21.128 ÷ 8 =
22. 22.24 + 23 =
23. 23.You buy a kite for ₹32 and a pen for ₹34. You pay with a ₹100 note. How much change do you get, in rupees?
24. 24.29 × 4 =
25. 25.223 − 188 =
26. 26.316 − 285 =
27. 27.57 + 14 =
28. 28.1014 − 991 =
29. 29.A train leaves at 2:50 and reaches the next city at 3:40. How many minutes is the journey?
30. 30.72 + 52 =
31. 31.Best estimate of 92 × 20? (a) 1800 (b) 18000 (c) 180
32. 32.What is the remainder when 52 is divided by 7?
33. 33.19² =
34. 34.527 − 491 =
35. 35.21 children stand in rows of 4. How many full rows can they make?
36. 36.46 + ? = 100
37. 37.30 × 8 =
38. 38.10% of ₹560 =
39. 39.38 + 4 =
40. 40.29 + 28 =

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