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Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 285 · 40 questions
TalentJR

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.

NameDateTime takenScore ___ / 40
  1. 1.Half of 144 =
  2. 2.87 + 83 =
  3. 3.2 + ? = 10
  4. 4.75 × 5 =
  5. 5.54 − 26 =
  6. 6.71 × 9 =
  7. 7.56 + 57 =
  8. 8.15 × 3 =
  9. 9.87 + ? = 100
  10. 10.Best estimate of 87 × 87? (a) 81000 (b) 8100 (c) 810
  11. 11.17² =
  12. 12.Best estimate of 484 + 720? (a) 1400 (b) 1000 (c) 1200
  13. 13.73 − 30 =
  14. 14.10% of ₹90 =
  15. 15.85 × 8 =
  16. 16.A film starts at 2:00 and ends at 3:40. How many minutes long is the film?
  17. 17.1009 − 994 =
  18. 18.37 + 4 =
  19. 19.28 + 8 =
  20. 20.25% of ₹410 =
  21. 21.Half of 100 =
  22. 22.12 × 8 =
  23. 23.16² =
  24. 24.12 × 5 =
  25. 25.110 ÷ 5 =
  26. 26.Half of 42 =
  27. 27.A train leaves at 5:30 and reaches the next city at 8:15. How many minutes is the journey?
  28. 28.Best estimate of 70 × 63? (a) 42000 (b) 4200 (c) 420
  29. 29.66 laddoos are packed in boxes of 9. How many laddoos are left over?
  30. 30.Half of 58 =
  31. 31.21² =
  32. 32.46 + 5 =
  33. 33.69 + ? = 100
  34. 34.56 + 7 =
  35. 35.17 × 8 =
  36. 36.62 × 7 =
  37. 37.6 + 7 =
  38. 38.322 − 276 =
  39. 39.6 + 5 =
  40. 40.25% of ₹470 =

Answer key

  1. 72
  2. 170
  3. 8
  4. 375
  5. 28
  6. 639
  7. 113
  8. 45
  9. 13
  10. 8100
  11. 289
  12. 1200
  13. 43
  14. 9
  15. 680
  16. 100
  17. 15
  18. 41
  19. 36
  20. 102.5
  21. 50
  22. 96
  23. 256
  24. 60
  25. 22
  26. 21
  27. 165
  28. 4200
  29. 3
  30. 29
  31. 441
  32. 51
  33. 31
  34. 63
  35. 136
  36. 434
  37. 13
  38. 46
  39. 11
  40. 117.5

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