Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 839 · 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. 1.15² =
2. 2.15 + 16 =
3. 3.472 ÷ 8 =
4. 4.192 ÷ 8 =
5. 5.43 laddoos are packed in boxes of 3. How many laddoos are left over?
6. 6.514 − 488 =
7. 7.168 ÷ 8 =
8. 8.2 + ? = 10
9. 9.Best estimate of 481 + 216? (a) 900 (b) 700 (c) 500
10. 10.120 ÷ 8 =
11. 11.112 ÷ 4 =
12. 12.Best estimate of 50 × 14? (a) 500 (b) 5000 (c) 50
13. 13.60 + 29 =
14. 14.You start your homework at 8:55 and finish at 11:55. How many minutes did you work?
15. 15.Half of 28 =
16. 16.63 + 54 =
17. 17.You buy a kite for ₹35 and pay with a ₹100 note. How much change do you get, in rupees?
18. 18.328 − 288 =
19. 19.16 + 8 =
20. 20.A train leaves at 3:40 and reaches the next city at 6:10. How many minutes is the journey?
21. 21.80 ÷ 4 =
22. 22.You buy a bag of mangoes for ₹73 and pay with a ₹100 note. How much change do you get, in rupees?
23. 23.Best estimate of 617 + 758? (a) 1200 (b) 1600 (c) 1400
24. 24.296 ÷ 8 =
25. 25.42 + ? = 100
26. 26.14 + 16 =
27. 27.744 ÷ 8 =
28. 28.37 × 4 =
29. 29.You buy a water bottle for ₹23 and a pen for ₹34. You pay with a ₹100 note. How much change do you get, in rupees?
30. 30.205 − 196 =
31. 31.29 + 54 =
32. 32.41 + 41 =
33. 33.Best estimate of 147 + 498? (a) 800 (b) 400 (c) 600
34. 34.92 − 68 =
35. 35.13 × 5 =
36. 36.69 children stand in rows of 7. How many full rows can they make?
37. 37.7 + ? = 10
38. 38.89 − 34 =
39. 39.Double 22 =
40. 40.16² =

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