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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 581 · 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. 1.25% of 170 =
  2. 2.5% of 150 =
  3. 3.50% of 660 =
  4. 4.10% of 120 =
  5. 5.50% of 420 =
  6. 6.10% of 650 =
  7. 7.20% of 770 =
  8. 8.15% of 110 =
  9. 9.5% of 220 =
  10. 10.50% of 390 =
  11. 11.25% of 540 =
  12. 12.15% of 180 =
  13. 13.15% of 260 =
  14. 14.5% of 200 =
  15. 15.1% of 750 =
  16. 16.10% of 420 =
  17. 17.10% of 590 =
  18. 18.5% of 290 =
  19. 19.10% of 880 =
  20. 20.10% of 540 =
  21. 21.20% of 450 =
  22. 22.20% of 830 =
  23. 23.10% of 180 =
  24. 24.15% of 500 =
  25. 25.10% of 380 =
  26. 26.25% of 850 =
  27. 27.25% of 520 =
  28. 28.1% of 850 =
  29. 29.15% of 710 =
  30. 30.20% of 820 =
  31. 31.25% of 330 =
  32. 32.20% of 150 =
  33. 33.15% of 170 =
  34. 34.10% of 160 =
  35. 35.15% of 460 =
  36. 36.25% of 120 =
  37. 37.1% of 710 =
  38. 38.5% of 110 =
  39. 39.20% of 530 =
  40. 40.1% of 540 =

Answer key

  1. 42.5
  2. 7.5
  3. 330
  4. 12
  5. 210
  6. 65
  7. 154
  8. 16.5
  9. 11
  10. 195
  11. 135
  12. 27
  13. 39
  14. 10
  15. 7.5
  16. 42
  17. 59
  18. 14.5
  19. 88
  20. 54
  21. 90
  22. 166
  23. 18
  24. 75
  25. 38
  26. 212.5
  27. 130
  28. 8.5
  29. 106.5
  30. 164
  31. 82.5
  32. 30
  33. 25.5
  34. 16
  35. 69
  36. 30
  37. 7.1
  38. 5.5
  39. 106
  40. 5.4

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