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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 811 · 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. 1.15% of 660 =
  2. 2.20% of 590 =
  3. 3.1% of 810 =
  4. 4.15% of 220 =
  5. 5.15% of 90 =
  6. 6.20% of 570 =
  7. 7.50% of 790 =
  8. 8.50% of 620 =
  9. 9.10% of 900 =
  10. 10.1% of 50 =
  11. 11.15% of 800 =
  12. 12.1% of 20 =
  13. 13.25% of 610 =
  14. 14.15% of 470 =
  15. 15.5% of 340 =
  16. 16.25% of 530 =
  17. 17.10% of 570 =
  18. 18.10% of 310 =
  19. 19.50% of 710 =
  20. 20.20% of 500 =
  21. 21.25% of 350 =
  22. 22.50% of 180 =
  23. 23.25% of 530 =
  24. 24.20% of 800 =
  25. 25.5% of 30 =
  26. 26.1% of 570 =
  27. 27.20% of 40 =
  28. 28.15% of 440 =
  29. 29.10% of 880 =
  30. 30.5% of 860 =
  31. 31.10% of 680 =
  32. 32.1% of 370 =
  33. 33.1% of 470 =
  34. 34.25% of 890 =
  35. 35.50% of 220 =
  36. 36.5% of 60 =
  37. 37.5% of 810 =
  38. 38.15% of 410 =
  39. 39.50% of 440 =
  40. 40.20% of 140 =

Answer key

  1. 99
  2. 118
  3. 8.1
  4. 33
  5. 13.5
  6. 114
  7. 395
  8. 310
  9. 90
  10. 0.5
  11. 120
  12. 0.2
  13. 152.5
  14. 70.5
  15. 17
  16. 132.5
  17. 57
  18. 31
  19. 355
  20. 100
  21. 87.5
  22. 90
  23. 132.5
  24. 160
  25. 1.5
  26. 5.7
  27. 8
  28. 66
  29. 88
  30. 43
  31. 68
  32. 3.7
  33. 4.7
  34. 222.5
  35. 110
  36. 3
  37. 40.5
  38. 61.5
  39. 220
  40. 28

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