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Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 641 · 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 559 + 692? (a) 1300 (b) 1500 (c) 1100
  2. 2.23² =
  3. 3.16 × 8 =
  4. 4.25² =
  5. 5.74 − 30 =
  6. 6.77 + 8 =
  7. 7.12 + 9 =
  8. 8.75 + 79 =
  9. 9.1019 − 995 =
  10. 10.5 + 6 =
  11. 11.A cricket match starts at 5:25 and the first innings ends at 8:25. How many minutes did the innings last?
  12. 12.28 + 5 =
  13. 13.50% of ₹380 =
  14. 14.14 + 13 =
  15. 15.30 + 47 =
  16. 16.34 × 6 =
  17. 17.25 + 9 =
  18. 18.12 + 11 =
  19. 19.Best estimate of 38 × 33? (a) 1200 (b) 12000 (c) 120
  20. 20.48 ÷ 4 =
  21. 21.Half of 64 =
  22. 22.58 + 29 =
  23. 23.85 + 21 =
  24. 24.5 + ? = 10
  25. 25.82 × 9 =
  26. 26.A train leaves at 1:15 and reaches the next city at 3:20. How many minutes is the journey?
  27. 27.28 + 32 =
  28. 28.220 − 175 =
  29. 29.77 + 9 =
  30. 30.Best estimate of 46 × 66? (a) 3500 (b) 350 (c) 35000
  31. 31.88 − 67 =
  32. 32.13² =
  33. 33.Half of 120 =
  34. 34.61 − 47 =
  35. 35.61 − 33 =
  36. 36.Best estimate of 81 × 98? (a) 80000 (b) 8000 (c) 800
  37. 37.5 + 7 =
  38. 38.70 × 4 =
  39. 39.11² =
  40. 40.2 + ? = 10

Answer key

  1. 1300
  2. 529
  3. 128
  4. 625
  5. 44
  6. 85
  7. 21
  8. 154
  9. 24
  10. 11
  11. 180
  12. 33
  13. 190
  14. 27
  15. 77
  16. 204
  17. 34
  18. 23
  19. 1200
  20. 12
  21. 32
  22. 87
  23. 106
  24. 5
  25. 738
  26. 125
  27. 60
  28. 45
  29. 86
  30. 3500
  31. 21
  32. 169
  33. 60
  34. 14
  35. 28
  36. 8000
  37. 12
  38. 280
  39. 121
  40. 8

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