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Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 51 · 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. 1.12 + 11 =
  2. 2.Best estimate of 536 + 351? (a) 700 (b) 900 (c) 1100
  3. 3.248 ÷ 8 =
  4. 4.29 + 31 =
  5. 5.505 − 483 =
  6. 6.45 + 9 =
  7. 7.70 − 57 =
  8. 8.56 + 5 =
  9. 9.22 + 21 =
  10. 10.58 + 9 =
  11. 11.413 ÷ 7 =
  12. 12.16 + 17 =
  13. 13.26 × 8 =
  14. 14.Best estimate of 19 × 43? (a) 80 (b) 8000 (c) 800
  15. 15.79 + ? = 100
  16. 16.65 + 23 =
  17. 17.You buy a box of crayons for ₹90 and pay with a ₹100 note. How much change do you get, in rupees?
  18. 18.You buy a bag of mangoes for ₹380 and pay with a ₹500 note. How much change do you get, in rupees?
  19. 19.23 + 25 =
  20. 20.64 ÷ 4 =
  21. 21.77 + 8 =
  22. 22.Half of 74 =
  23. 23.192 ÷ 3 =
  24. 24.252 ÷ 6 =
  25. 25.97 − 56 =
  26. 26.Best estimate of 480 + 608? (a) 900 (b) 1300 (c) 1100
  27. 27.47 + 64 =
  28. 28.10 + 12 =
  29. 29.27 + 28 =
  30. 30.57 + 57 =
  31. 31.You buy a box of crayons for ₹61 and pay with a ₹100 note. How much change do you get, in rupees?
  32. 32.71 × 4 =
  33. 33.514 − 486 =
  34. 34.29² =
  35. 35.13 × 8 =
  36. 36.21 × 8 =
  37. 37.31 + 19 =
  38. 38.33 + 17 =
  39. 39.86 + ? = 100
  40. 40.69 + 3 =

Answer key

  1. 23
  2. 900
  3. 31
  4. 60
  5. 22
  6. 54
  7. 13
  8. 61
  9. 43
  10. 67
  11. 59
  12. 33
  13. 208
  14. 800
  15. 21
  16. 88
  17. 10
  18. 120
  19. 48
  20. 16
  21. 85
  22. 37
  23. 64
  24. 42
  25. 41
  26. 1100
  27. 111
  28. 22
  29. 55
  30. 114
  31. 39
  32. 284
  33. 28
  34. 841
  35. 104
  36. 168
  37. 50
  38. 50
  39. 14
  40. 72

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