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Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 906 · 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. 1.91 − 78 =
  2. 2.15 + 16 =
  3. 3.87 − 67 =
  4. 4.60 children stand in rows of 9. How many full rows can they make?
  5. 5.50% of ₹370 =
  6. 6.10 + 9 =
  7. 7.320 − 281 =
  8. 8.86 + 63 =
  9. 9.Half of 126 =
  10. 10.Half of 114 =
  11. 11.18 + ? = 100
  12. 12.Double 81 =
  13. 13.Best estimate of 142 + 344? (a) 600 (b) 200 (c) 400
  14. 14.Best estimate of 49 × 96? (a) 5000 (b) 50000 (c) 500
  15. 15.114 − 86 =
  16. 16.20 × 4 =
  17. 17.30 + 31 =
  18. 18.79 + 4 =
  19. 19.7 + 8 =
  20. 20.Best estimate of 34 × 36? (a) 120 (b) 12000 (c) 1200
  21. 21.13² =
  22. 22.24 + 23 =
  23. 23.54 + 31 =
  24. 24.Double 38 =
  25. 25.308 ÷ 4 =
  26. 26.Double 71 =
  27. 27.5 + ? = 10
  28. 28.9 + 11 =
  29. 29.7 + 6 =
  30. 30.A cricket match starts at 6:10 and the first innings ends at 6:35. How many minutes did the innings last?
  31. 31.9 + 4 =
  32. 32.107 − 29 =
  33. 33.6 + 8 =
  34. 34.You buy a water bottle for ₹68 and pay with a ₹100 note. How much change do you get, in rupees?
  35. 35.35 + 6 =
  36. 36.17² =
  37. 37.50% of ₹240 =
  38. 38.2 + ? = 10
  39. 39.90 − 58 =
  40. 40.51 + ? = 100

Answer key

  1. 13
  2. 31
  3. 20
  4. 6
  5. 185
  6. 19
  7. 39
  8. 149
  9. 63
  10. 57
  11. 82
  12. 162
  13. 400
  14. 5000
  15. 28
  16. 80
  17. 61
  18. 83
  19. 15
  20. 1200
  21. 169
  22. 47
  23. 85
  24. 76
  25. 77
  26. 142
  27. 5
  28. 20
  29. 13
  30. 25
  31. 13
  32. 78
  33. 14
  34. 32
  35. 41
  36. 289
  37. 120
  38. 8
  39. 32
  40. 49

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