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Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 902 · 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 77 × 20? (a) 160 (b) 16000 (c) 1600
  2. 2.Half of 32 =
  3. 3.5 + ? = 10
  4. 4.77 + 54 =
  5. 5.60 + ? = 100
  6. 6.26 + 67 =
  7. 7.54 − 21 =
  8. 8.79 − 25 =
  9. 9.79 + 34 =
  10. 10.176 ÷ 4 =
  11. 11.88 − 72 =
  12. 12.7 + ? = 10
  13. 13.14² =
  14. 14.25% of ₹640 =
  15. 15.Half of 62 =
  16. 16.28² =
  17. 17.46 children stand in rows of 6. How many full rows can they make?
  18. 18.Half of 30 =
  19. 19.608 ÷ 8 =
  20. 20.10% of ₹210 =
  21. 21.A train leaves at 2:05 and reaches the next city at 2:55. How many minutes is the journey?
  22. 22.14 + ? = 100
  23. 23.89 − 17 =
  24. 24.1015 − 996 =
  25. 25.18 + 17 =
  26. 26.16² =
  27. 27.27² =
  28. 28.What is the remainder when 59 is divided by 8?
  29. 29.64 − 51 =
  30. 30.29 + 4 =
  31. 31.30 × 8 =
  32. 32.A film starts at 1:35 and ends at 4:45. How many minutes long is the film?
  33. 33.28 + 55 =
  34. 34.27 + 48 =
  35. 35.25% of ₹740 =
  36. 36.74 − 21 =
  37. 37.Best estimate of 92 × 64? (a) 54000 (b) 5400 (c) 540
  38. 38.1015 − 998 =
  39. 39.748 + 99 =
  40. 40.528 − 492 =

Answer key

  1. 1600
  2. 16
  3. 5
  4. 131
  5. 40
  6. 93
  7. 33
  8. 54
  9. 113
  10. 44
  11. 16
  12. 3
  13. 196
  14. 160
  15. 31
  16. 784
  17. 7
  18. 15
  19. 76
  20. 21
  21. 50
  22. 86
  23. 72
  24. 19
  25. 35
  26. 256
  27. 729
  28. 3
  29. 13
  30. 33
  31. 240
  32. 190
  33. 83
  34. 75
  35. 185
  36. 53
  37. 5400
  38. 17
  39. 847
  40. 36

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