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Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 497 · 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. 1.18 + 19 =
  2. 2.Best estimate of 83 × 32? (a) 240 (b) 24000 (c) 2400
  3. 3.62 × 4 =
  4. 4.Best estimate of 468 + 703? (a) 1200 (b) 1400 (c) 1000
  5. 5.Double 33 =
  6. 6.73 + 9 =
  7. 7.18² =
  8. 8.A film starts at 2:15 and ends at 4:20. How many minutes long is the film?
  9. 9.Best estimate of 51 × 41? (a) 2000 (b) 20000 (c) 200
  10. 10.40 × 4 =
  11. 11.69 − 45 =
  12. 12.84 − 31 =
  13. 13.89 + 8 =
  14. 14.218 − 183 =
  15. 15.53 × 6 =
  16. 16.5% of ₹800 =
  17. 17.25 + 27 =
  18. 18.59 − 38 =
  19. 19.378 ÷ 7 =
  20. 20.58 children stand in rows of 9. How many full rows can they make?
  21. 21.25² =
  22. 22.23² =
  23. 23.28 + 4 =
  24. 24.64 − 18 =
  25. 25.Best estimate of 836 + 174? (a) 1000 (b) 800 (c) 1200
  26. 26.67 + 7 =
  27. 27.22 + ? = 100
  28. 28.5% of ₹300 =
  29. 29.26² =
  30. 30.55 + 8 =
  31. 31.305 − 283 =
  32. 32.Best estimate of 46 × 23? (a) 100 (b) 10000 (c) 1000
  33. 33.228 ÷ 4 =
  34. 34.67 + 46 =
  35. 35.288 ÷ 8 =
  36. 36.15² =
  37. 37.5% of ₹570 =
  38. 38.65 − 41 =
  39. 39.13 + ? = 100
  40. 40.10% of ₹320 =

Answer key

  1. 37
  2. 2400
  3. 248
  4. 1200
  5. 66
  6. 82
  7. 324
  8. 125
  9. 2000
  10. 160
  11. 24
  12. 53
  13. 97
  14. 35
  15. 318
  16. 40
  17. 52
  18. 21
  19. 54
  20. 6
  21. 625
  22. 529
  23. 32
  24. 46
  25. 1000
  26. 74
  27. 78
  28. 15
  29. 676
  30. 63
  31. 22
  32. 1000
  33. 57
  34. 113
  35. 36
  36. 225
  37. 28.5
  38. 24
  39. 87
  40. 32

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