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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 820 · 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. 1.50% of 620 =
  2. 2.15% of 840 =
  3. 3.10% of 780 =
  4. 4.50% of 470 =
  5. 5.15% of 670 =
  6. 6.5% of 210 =
  7. 7.5% of 190 =
  8. 8.50% of 130 =
  9. 9.10% of 400 =
  10. 10.50% of 460 =
  11. 11.1% of 140 =
  12. 12.25% of 510 =
  13. 13.1% of 30 =
  14. 14.15% of 80 =
  15. 15.5% of 340 =
  16. 16.20% of 790 =
  17. 17.10% of 280 =
  18. 18.25% of 650 =
  19. 19.1% of 190 =
  20. 20.15% of 90 =
  21. 21.1% of 740 =
  22. 22.10% of 210 =
  23. 23.10% of 350 =
  24. 24.5% of 80 =
  25. 25.15% of 280 =
  26. 26.10% of 170 =
  27. 27.25% of 240 =
  28. 28.25% of 90 =
  29. 29.5% of 400 =
  30. 30.25% of 230 =
  31. 31.25% of 610 =
  32. 32.5% of 470 =
  33. 33.10% of 460 =
  34. 34.20% of 850 =
  35. 35.10% of 70 =
  36. 36.25% of 860 =
  37. 37.1% of 120 =
  38. 38.15% of 720 =
  39. 39.20% of 660 =
  40. 40.15% of 840 =

Answer key

  1. 310
  2. 126
  3. 78
  4. 235
  5. 100.5
  6. 10.5
  7. 9.5
  8. 65
  9. 40
  10. 230
  11. 1.4
  12. 127.5
  13. 0.3
  14. 12
  15. 17
  16. 158
  17. 28
  18. 162.5
  19. 1.9
  20. 13.5
  21. 7.4
  22. 21
  23. 35
  24. 4
  25. 42
  26. 17
  27. 60
  28. 22.5
  29. 20
  30. 57.5
  31. 152.5
  32. 23.5
  33. 46
  34. 170
  35. 7
  36. 215
  37. 1.2
  38. 108
  39. 132
  40. 126

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