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Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 378 · 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. 1.78 − 19 =
  2. 2.48 × 3 =
  3. 3.20 + ? = 100
  4. 4.90 ÷ 6 =
  5. 5.27 + 47 =
  6. 6.Best estimate of 46 × 47? (a) 2500 (b) 25000 (c) 250
  7. 7.19 + 2 =
  8. 8.18 × 7 =
  9. 9.280 ÷ 5 =
  10. 10.6 + 7 =
  11. 11.50% of ₹790 =
  12. 12.320 ÷ 8 =
  13. 13.20 + 19 =
  14. 14.27² =
  15. 15.22² =
  16. 16.69 + 6 =
  17. 17.10 + 12 =
  18. 18.5% of ₹440 =
  19. 19.56 + 64 =
  20. 20.64 + ? = 100
  21. 21.Best estimate of 88 × 33? (a) 27000 (b) 2700 (c) 270
  22. 22.77 − 13 =
  23. 23.733 + 99 =
  24. 24.50% of ₹150 =
  25. 25.15² =
  26. 26.81 − 78 =
  27. 27.454 − 99 =
  28. 28.75 + 8 =
  29. 29.7 + 6 =
  30. 30.Best estimate of 579 + 146? (a) 900 (b) 700 (c) 500
  31. 31.23 × 8 =
  32. 32.168 ÷ 8 =
  33. 33.29 + 28 =
  34. 34.18 + 19 =
  35. 35.10 + 11 =
  36. 36.21 × 4 =
  37. 37.8 + 7 =
  38. 38.180 ÷ 4 =
  39. 39.8 + 10 =
  40. 40.Double 36 =

Answer key

  1. 59
  2. 144
  3. 80
  4. 15
  5. 74
  6. 2500
  7. 21
  8. 126
  9. 56
  10. 13
  11. 395
  12. 40
  13. 39
  14. 729
  15. 484
  16. 75
  17. 22
  18. 22
  19. 120
  20. 36
  21. 2700
  22. 64
  23. 832
  24. 75
  25. 225
  26. 3
  27. 355
  28. 83
  29. 13
  30. 700
  31. 184
  32. 21
  33. 57
  34. 37
  35. 21
  36. 84
  37. 15
  38. 45
  39. 18
  40. 72

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