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Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 347 · 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. 1.8 + 5 =
  2. 2.Double 36 =
  3. 3.8 + ? = 10
  4. 4.604 − 99 =
  5. 5.77 − 18 =
  6. 6.61 − 38 =
  7. 7.323 − 290 =
  8. 8.17 + 16 =
  9. 9.Double 44 =
  10. 10.60 + 31 =
  11. 11.876 − 99 =
  12. 12.73 − 46 =
  13. 13.Best estimate of 47 × 82? (a) 400 (b) 4000 (c) 40000
  14. 14.74 + 9 =
  15. 15.22 + 57 =
  16. 16.65 + 9 =
  17. 17.3 + ? = 10
  18. 18.30 + ? = 100
  19. 19.You buy a kite for ₹20 and a pen for ₹45. You pay with a ₹100 note. How much change do you get, in rupees?
  20. 20.1004 − 997 =
  21. 21.15² =
  22. 22.Best estimate of 17 × 33? (a) 600 (b) 6000 (c) 60
  23. 23.You buy a water bottle for ₹99 and pay with a ₹100 note. How much change do you get, in rupees?
  24. 24.50% of ₹390 =
  25. 25.682 − 99 =
  26. 26.74 − 19 =
  27. 27.49 + 3 =
  28. 28.78 ÷ 3 =
  29. 29.19 + 20 =
  30. 30.9 + 11 =
  31. 31.9 + ? = 10
  32. 32.319 − 279 =
  33. 33.What is the remainder when 64 is divided by 7?
  34. 34.55 + 13 =
  35. 35.28² =
  36. 36.Best estimate of 783 + 209? (a) 1200 (b) 800 (c) 1000
  37. 37.10% of ₹200 =
  38. 38.Best estimate of 74 × 31? (a) 2100 (b) 210 (c) 21000
  39. 39.79 − 21 =
  40. 40.5% of ₹60 =

Answer key

  1. 13
  2. 72
  3. 2
  4. 505
  5. 59
  6. 23
  7. 33
  8. 33
  9. 88
  10. 91
  11. 777
  12. 27
  13. 4000
  14. 83
  15. 79
  16. 74
  17. 7
  18. 70
  19. 35
  20. 7
  21. 225
  22. 600
  23. 1
  24. 195
  25. 583
  26. 55
  27. 52
  28. 26
  29. 39
  30. 20
  31. 1
  32. 40
  33. 1
  34. 68
  35. 784
  36. 1000
  37. 20
  38. 2100
  39. 58
  40. 3

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