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Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 405 · 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.Best estimate of 27 × 36? (a) 120 (b) 12000 (c) 1200
  2. 2.55 × 4 =
  3. 3.52 + 18 =
  4. 4.Half of 124 =
  5. 5.58 + 9 =
  6. 6.86 + 87 =
  7. 7.66 + 7 =
  8. 8.63 + 19 =
  9. 9.65 − 39 =
  10. 10.6 + 8 =
  11. 11.62 × 3 =
  12. 12.110 − 78 =
  13. 13.25 + 8 =
  14. 14.Best estimate of 127 + 724? (a) 1000 (b) 600 (c) 800
  15. 15.8 + 7 =
  16. 16.97 − 78 =
  17. 17.50% of ₹510 =
  18. 18.Best estimate of 654 + 397? (a) 900 (b) 1300 (c) 1100
  19. 19.Half of 60 =
  20. 20.A train leaves at 2:20 and reaches the next city at 3:10. How many minutes is the journey?
  21. 21.75 − 35 =
  22. 22.317 − 289 =
  23. 23.21 + 22 =
  24. 24.11 + 12 =
  25. 25.73 + 27 =
  26. 26.57 + 9 =
  27. 27.18 − 9 =
  28. 28.19 + 21 =
  29. 29.85 × 6 =
  30. 30.440 ÷ 5 =
  31. 31.50 + 14 =
  32. 32.25 laddoos are packed in boxes of 6. How many laddoos are left over?
  33. 33.42 ÷ 3 =
  34. 34.79 − 12 =
  35. 35.Best estimate of 727 + 247? (a) 900 (b) 1100 (c) 700
  36. 36.Double 75 =
  37. 37.You start your homework at 2:05 and finish at 3:55. How many minutes did you work?
  38. 38.98 − 12 =
  39. 39.45 + 9 =
  40. 40.93 ÷ 3 =

Answer key

  1. 1200
  2. 220
  3. 70
  4. 62
  5. 67
  6. 173
  7. 73
  8. 82
  9. 26
  10. 14
  11. 186
  12. 32
  13. 33
  14. 800
  15. 15
  16. 19
  17. 255
  18. 1100
  19. 30
  20. 50
  21. 40
  22. 28
  23. 43
  24. 23
  25. 100
  26. 66
  27. 9
  28. 40
  29. 510
  30. 88
  31. 64
  32. 1
  33. 14
  34. 67
  35. 900
  36. 150
  37. 110
  38. 86
  39. 54
  40. 31

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