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Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 865 · 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. 1.74 − 19 =
  2. 2.75 − 29 =
  3. 3.48 − 9 =
  4. 4.5% of ₹130 =
  5. 5.91 − 13 =
  6. 6.24² =
  7. 7.354 − 99 =
  8. 8.11² =
  9. 9.31 − 19 =
  10. 10.32 + 29 =
  11. 11.Best estimate of 42 × 21? (a) 800 (b) 80 (c) 8000
  12. 12.71 × 3 =
  13. 13.18 + 17 =
  14. 14.34 × 6 =
  15. 15.429 − 99 =
  16. 16.6 + 9 =
  17. 17.25 laddoos are packed in boxes of 4. How many laddoos are left over?
  18. 18.35 − 29 =
  19. 19.50 × 4 =
  20. 20.4 + ? = 10
  21. 21.60 − 36 =
  22. 22.128 ÷ 4 =
  23. 23.29 + 30 =
  24. 24.50 + ? = 100
  25. 25.19 + 18 =
  26. 26.21² =
  27. 27.25² =
  28. 28.55 − 13 =
  29. 29.22 × 6 =
  30. 30.32 + 39 =
  31. 31.Best estimate of 70 × 32? (a) 21000 (b) 210 (c) 2100
  32. 32.23 + 25 =
  33. 33.44 − 9 =
  34. 34.31 + ? = 100
  35. 35.25% of ₹180 =
  36. 36.You buy a kite for ₹54 and pay with a ₹100 note. How much change do you get, in rupees?
  37. 37.94 × 4 =
  38. 38.19 + 21 =
  39. 39.You start your homework at 4:25 and finish at 4:50. How many minutes did you work?
  40. 40.50% of ₹680 =

Answer key

  1. 55
  2. 46
  3. 39
  4. 6.5
  5. 78
  6. 576
  7. 255
  8. 121
  9. 12
  10. 61
  11. 800
  12. 213
  13. 35
  14. 204
  15. 330
  16. 15
  17. 1
  18. 6
  19. 200
  20. 6
  21. 24
  22. 32
  23. 59
  24. 50
  25. 37
  26. 441
  27. 625
  28. 42
  29. 132
  30. 71
  31. 2100
  32. 48
  33. 35
  34. 69
  35. 45
  36. 46
  37. 376
  38. 40
  39. 25
  40. 340

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