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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 905 · 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 800 =
  2. 2.25% of 570 =
  3. 3.50% of 40 =
  4. 4.15% of 360 =
  5. 5.25% of 50 =
  6. 6.1% of 90 =
  7. 7.10% of 150 =
  8. 8.5% of 780 =
  9. 9.50% of 620 =
  10. 10.1% of 500 =
  11. 11.15% of 360 =
  12. 12.25% of 260 =
  13. 13.1% of 300 =
  14. 14.50% of 370 =
  15. 15.50% of 390 =
  16. 16.15% of 160 =
  17. 17.5% of 510 =
  18. 18.20% of 240 =
  19. 19.20% of 810 =
  20. 20.50% of 660 =
  21. 21.15% of 690 =
  22. 22.10% of 330 =
  23. 23.20% of 770 =
  24. 24.20% of 790 =
  25. 25.15% of 400 =
  26. 26.50% of 660 =
  27. 27.25% of 470 =
  28. 28.50% of 710 =
  29. 29.10% of 230 =
  30. 30.10% of 400 =
  31. 31.1% of 630 =
  32. 32.15% of 160 =
  33. 33.15% of 20 =
  34. 34.25% of 350 =
  35. 35.25% of 560 =
  36. 36.1% of 520 =
  37. 37.50% of 880 =
  38. 38.20% of 90 =
  39. 39.25% of 890 =
  40. 40.15% of 690 =

Answer key

  1. 120
  2. 142.5
  3. 20
  4. 54
  5. 12.5
  6. 0.9
  7. 15
  8. 39
  9. 310
  10. 5
  11. 54
  12. 65
  13. 3
  14. 185
  15. 195
  16. 24
  17. 25.5
  18. 48
  19. 162
  20. 330
  21. 103.5
  22. 33
  23. 154
  24. 158
  25. 60
  26. 330
  27. 117.5
  28. 355
  29. 23
  30. 40
  31. 6.3
  32. 24
  33. 3
  34. 87.5
  35. 140
  36. 5.2
  37. 440
  38. 18
  39. 222.5
  40. 103.5

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