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Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 693 · 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. 1.24 + 26 =
  2. 2.89 + 4 =
  3. 3.81 − 47 =
  4. 4.64 + ? = 100
  5. 5.5% of ₹900 =
  6. 6.20 + 21 =
  7. 7.46 + 6 =
  8. 8.Best estimate of 257 + 190? (a) 700 (b) 500 (c) 300
  9. 9.80 + 29 =
  10. 10.4 + ? = 10
  11. 11.A cricket match starts at 8:40 and the first innings ends at 11:30. How many minutes did the innings last?
  12. 12.22² =
  13. 13.85 × 4 =
  14. 14.7 + 8 =
  15. 15.Best estimate of 16 × 17? (a) 40 (b) 400 (c) 4000
  16. 16.18 + 20 =
  17. 17.Half of 58 =
  18. 18.200 ÷ 4 =
  19. 19.Best estimate of 524 + 714? (a) 1200 (b) 1000 (c) 1400
  20. 20.63 − 17 =
  21. 21.50 − 19 =
  22. 22.What is the remainder when 123 is divided by 8?
  23. 23.26 + 61 =
  24. 24.53 + 75 =
  25. 25.526 − 496 =
  26. 26.33 + 77 =
  27. 27.18² =
  28. 28.Double 33 =
  29. 29.213 − 195 =
  30. 30.26 − 9 =
  31. 31.15 + 16 =
  32. 32.324 − 296 =
  33. 33.25% of ₹140 =
  34. 34.Best estimate of 56 × 84? (a) 48000 (b) 4800 (c) 480
  35. 35.81 × 3 =
  36. 36.55 − 15 =
  37. 37.64 + 22 =
  38. 38.41 × 8 =
  39. 39.19² =
  40. 40.105 − 86 =

Answer key

  1. 50
  2. 93
  3. 34
  4. 36
  5. 45
  6. 41
  7. 52
  8. 500
  9. 109
  10. 6
  11. 170
  12. 484
  13. 340
  14. 15
  15. 400
  16. 38
  17. 29
  18. 50
  19. 1200
  20. 46
  21. 31
  22. 3
  23. 87
  24. 128
  25. 30
  26. 110
  27. 324
  28. 66
  29. 18
  30. 17
  31. 31
  32. 28
  33. 35
  34. 4800
  35. 243
  36. 40
  37. 86
  38. 328
  39. 361
  40. 19

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