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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 875 · 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 820 =
  2. 2.20% of 210 =
  3. 3.15% of 690 =
  4. 4.1% of 20 =
  5. 5.5% of 130 =
  6. 6.10% of 210 =
  7. 7.10% of 70 =
  8. 8.1% of 180 =
  9. 9.25% of 500 =
  10. 10.50% of 170 =
  11. 11.5% of 520 =
  12. 12.1% of 580 =
  13. 13.20% of 560 =
  14. 14.15% of 150 =
  15. 15.20% of 310 =
  16. 16.15% of 220 =
  17. 17.50% of 180 =
  18. 18.1% of 560 =
  19. 19.5% of 550 =
  20. 20.25% of 510 =
  21. 21.1% of 140 =
  22. 22.20% of 600 =
  23. 23.15% of 210 =
  24. 24.10% of 360 =
  25. 25.50% of 850 =
  26. 26.10% of 840 =
  27. 27.1% of 750 =
  28. 28.5% of 230 =
  29. 29.5% of 360 =
  30. 30.25% of 150 =
  31. 31.10% of 870 =
  32. 32.1% of 220 =
  33. 33.10% of 230 =
  34. 34.1% of 170 =
  35. 35.15% of 630 =
  36. 36.25% of 540 =
  37. 37.1% of 700 =
  38. 38.20% of 260 =
  39. 39.50% of 200 =
  40. 40.20% of 720 =

Answer key

  1. 123
  2. 42
  3. 103.5
  4. 0.2
  5. 6.5
  6. 21
  7. 7
  8. 1.8
  9. 125
  10. 85
  11. 26
  12. 5.8
  13. 112
  14. 22.5
  15. 62
  16. 33
  17. 90
  18. 5.6
  19. 27.5
  20. 127.5
  21. 1.4
  22. 120
  23. 31.5
  24. 36
  25. 425
  26. 84
  27. 7.5
  28. 11.5
  29. 18
  30. 37.5
  31. 87
  32. 2.2
  33. 23
  34. 1.7
  35. 94.5
  36. 135
  37. 7
  38. 52
  39. 100
  40. 144

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