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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 78 · 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 810 =
  2. 2.10% of 820 =
  3. 3.50% of 660 =
  4. 4.50% of 810 =
  5. 5.10% of 610 =
  6. 6.50% of 360 =
  7. 7.50% of 860 =
  8. 8.10% of 880 =
  9. 9.20% of 720 =
  10. 10.15% of 80 =
  11. 11.5% of 810 =
  12. 12.10% of 500 =
  13. 13.25% of 890 =
  14. 14.10% of 530 =
  15. 15.15% of 890 =
  16. 16.50% of 430 =
  17. 17.10% of 30 =
  18. 18.10% of 130 =
  19. 19.10% of 370 =
  20. 20.1% of 220 =
  21. 21.5% of 560 =
  22. 22.25% of 810 =
  23. 23.5% of 790 =
  24. 24.5% of 70 =
  25. 25.25% of 660 =
  26. 26.10% of 770 =
  27. 27.15% of 260 =
  28. 28.20% of 190 =
  29. 29.50% of 740 =
  30. 30.25% of 720 =
  31. 31.15% of 710 =
  32. 32.50% of 170 =
  33. 33.50% of 580 =
  34. 34.1% of 620 =
  35. 35.5% of 140 =
  36. 36.20% of 260 =
  37. 37.20% of 820 =
  38. 38.1% of 440 =
  39. 39.15% of 530 =
  40. 40.10% of 480 =

Answer key

  1. 8.1
  2. 82
  3. 330
  4. 405
  5. 61
  6. 180
  7. 430
  8. 88
  9. 144
  10. 12
  11. 40.5
  12. 50
  13. 222.5
  14. 53
  15. 133.5
  16. 215
  17. 3
  18. 13
  19. 37
  20. 2.2
  21. 28
  22. 202.5
  23. 39.5
  24. 3.5
  25. 165
  26. 77
  27. 39
  28. 38
  29. 370
  30. 180
  31. 106.5
  32. 85
  33. 290
  34. 6.2
  35. 7
  36. 52
  37. 164
  38. 4.4
  39. 79.5
  40. 48

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