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Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 105 · 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. 1.29 × 8 =
  2. 2.84 + ? = 100
  3. 3.28 × 7 =
  4. 4.6 + 7 =
  5. 5.371 ÷ 7 =
  6. 6.8 + 7 =
  7. 7.68 − 29 =
  8. 8.41 + ? = 100
  9. 9.505 − 491 =
  10. 10.A train leaves at 2:10 and reaches the next city at 3:25. How many minutes is the journey?
  11. 11.15² =
  12. 12.87 + 8 =
  13. 13.9 + 10 =
  14. 14.24 + 26 =
  15. 15.5% of ₹160 =
  16. 16.35 × 9 =
  17. 17.51 − 42 =
  18. 18.66 + ? = 100
  19. 19.47 + 21 =
  20. 20.86 − 78 =
  21. 21.82 − 74 =
  22. 22.204 ÷ 4 =
  23. 23.Half of 106 =
  24. 24.25 + 6 =
  25. 25.Best estimate of 433 + 809? (a) 1200 (b) 1000 (c) 1400
  26. 26.49 + 7 =
  27. 27.Best estimate of 315 + 646? (a) 900 (b) 700 (c) 1100
  28. 28.53 + 46 =
  29. 29.Best estimate of 29 × 78? (a) 24000 (b) 2400 (c) 240
  30. 30.306 − 282 =
  31. 31.58 + 4 =
  32. 32.61 × 4 =
  33. 33.Best estimate of 26 × 68? (a) 21000 (b) 210 (c) 2100
  34. 34.40 × 8 =
  35. 35.Best estimate of 532 + 249? (a) 700 (b) 500 (c) 900
  36. 36.You buy a cricket ball for ₹234 and pay with a ₹500 note. How much change do you get, in rupees?
  37. 37.224 ÷ 8 =
  38. 38.34 × 4 =
  39. 39.Half of 34 =
  40. 40.67 − 25 =

Answer key

  1. 232
  2. 16
  3. 196
  4. 13
  5. 53
  6. 15
  7. 39
  8. 59
  9. 14
  10. 75
  11. 225
  12. 95
  13. 19
  14. 50
  15. 8
  16. 315
  17. 9
  18. 34
  19. 68
  20. 8
  21. 8
  22. 51
  23. 53
  24. 31
  25. 1200
  26. 56
  27. 900
  28. 99
  29. 2400
  30. 24
  31. 62
  32. 244
  33. 2100
  34. 320
  35. 700
  36. 266
  37. 28
  38. 136
  39. 17
  40. 42

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