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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 513 · 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. 1.10% of 370 =
  2. 2.1% of 120 =
  3. 3.1% of 140 =
  4. 4.5% of 130 =
  5. 5.25% of 180 =
  6. 6.10% of 490 =
  7. 7.25% of 210 =
  8. 8.50% of 720 =
  9. 9.20% of 60 =
  10. 10.1% of 420 =
  11. 11.1% of 780 =
  12. 12.10% of 440 =
  13. 13.15% of 60 =
  14. 14.20% of 730 =
  15. 15.5% of 540 =
  16. 16.5% of 110 =
  17. 17.50% of 480 =
  18. 18.25% of 810 =
  19. 19.20% of 30 =
  20. 20.25% of 690 =
  21. 21.25% of 620 =
  22. 22.20% of 220 =
  23. 23.5% of 320 =
  24. 24.10% of 870 =
  25. 25.50% of 870 =
  26. 26.25% of 900 =
  27. 27.20% of 760 =
  28. 28.50% of 900 =
  29. 29.5% of 50 =
  30. 30.25% of 590 =
  31. 31.15% of 240 =
  32. 32.1% of 710 =
  33. 33.5% of 250 =
  34. 34.5% of 90 =
  35. 35.20% of 240 =
  36. 36.5% of 510 =
  37. 37.15% of 860 =
  38. 38.20% of 50 =
  39. 39.5% of 510 =
  40. 40.50% of 140 =

Answer key

  1. 37
  2. 1.2
  3. 1.4
  4. 6.5
  5. 45
  6. 49
  7. 52.5
  8. 360
  9. 12
  10. 4.2
  11. 7.8
  12. 44
  13. 9
  14. 146
  15. 27
  16. 5.5
  17. 240
  18. 202.5
  19. 6
  20. 172.5
  21. 155
  22. 44
  23. 16
  24. 87
  25. 435
  26. 225
  27. 152
  28. 450
  29. 2.5
  30. 147.5
  31. 36
  32. 7.1
  33. 12.5
  34. 4.5
  35. 48
  36. 25.5
  37. 129
  38. 10
  39. 25.5
  40. 70

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