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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 102 · 40 questions
TalentJR

The fast method (Build from 10%): 10%: divide by 10. 1%: divide by 100. 5% = half of 10%, 20% = double 10%, 15% = 10% + 5%. 50% = half, 25% = half of a half.

NameDateTime takenScore ___ / 40
  1. 1.1% of 210 =
  2. 2.5% of 330 =
  3. 3.15% of 320 =
  4. 4.20% of 330 =
  5. 5.10% of 730 =
  6. 6.1% of 70 =
  7. 7.10% of 310 =
  8. 8.10% of 410 =
  9. 9.25% of 460 =
  10. 10.20% of 120 =
  11. 11.5% of 360 =
  12. 12.25% of 210 =
  13. 13.1% of 730 =
  14. 14.15% of 650 =
  15. 15.5% of 750 =
  16. 16.5% of 150 =
  17. 17.5% of 230 =
  18. 18.5% of 570 =
  19. 19.15% of 420 =
  20. 20.15% of 160 =
  21. 21.10% of 140 =
  22. 22.20% of 80 =
  23. 23.5% of 830 =
  24. 24.10% of 90 =
  25. 25.50% of 520 =
  26. 26.10% of 670 =
  27. 27.20% of 640 =
  28. 28.50% of 420 =
  29. 29.5% of 80 =
  30. 30.10% of 340 =
  31. 31.25% of 290 =
  32. 32.50% of 390 =
  33. 33.25% of 190 =
  34. 34.10% of 120 =
  35. 35.20% of 460 =
  36. 36.50% of 130 =
  37. 37.5% of 870 =
  38. 38.50% of 90 =
  39. 39.1% of 470 =
  40. 40.10% of 890 =

Answer key

  1. 2.1
  2. 16.5
  3. 48
  4. 66
  5. 73
  6. 0.7
  7. 31
  8. 41
  9. 115
  10. 24
  11. 18
  12. 52.5
  13. 7.3
  14. 97.5
  15. 37.5
  16. 7.5
  17. 11.5
  18. 28.5
  19. 63
  20. 24
  21. 14
  22. 16
  23. 41.5
  24. 9
  25. 260
  26. 67
  27. 128
  28. 210
  29. 4
  30. 34
  31. 72.5
  32. 195
  33. 47.5
  34. 12
  35. 92
  36. 65
  37. 43.5
  38. 45
  39. 4.7
  40. 89

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