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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 704 · 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 820 =
  2. 2.5% of 440 =
  3. 3.25% of 120 =
  4. 4.15% of 480 =
  5. 5.15% of 900 =
  6. 6.1% of 450 =
  7. 7.20% of 230 =
  8. 8.50% of 250 =
  9. 9.10% of 90 =
  10. 10.15% of 520 =
  11. 11.20% of 640 =
  12. 12.15% of 470 =
  13. 13.1% of 230 =
  14. 14.5% of 20 =
  15. 15.10% of 690 =
  16. 16.10% of 630 =
  17. 17.15% of 720 =
  18. 18.1% of 40 =
  19. 19.10% of 740 =
  20. 20.20% of 800 =
  21. 21.20% of 700 =
  22. 22.25% of 160 =
  23. 23.15% of 230 =
  24. 24.15% of 520 =
  25. 25.15% of 330 =
  26. 26.50% of 740 =
  27. 27.1% of 840 =
  28. 28.15% of 550 =
  29. 29.1% of 130 =
  30. 30.1% of 580 =
  31. 31.25% of 400 =
  32. 32.25% of 150 =
  33. 33.10% of 60 =
  34. 34.10% of 20 =
  35. 35.25% of 660 =
  36. 36.5% of 90 =
  37. 37.25% of 850 =
  38. 38.10% of 870 =
  39. 39.20% of 320 =
  40. 40.5% of 100 =

Answer key

  1. 82
  2. 22
  3. 30
  4. 72
  5. 135
  6. 4.5
  7. 46
  8. 125
  9. 9
  10. 78
  11. 128
  12. 70.5
  13. 2.3
  14. 1
  15. 69
  16. 63
  17. 108
  18. 0.4
  19. 74
  20. 160
  21. 140
  22. 40
  23. 34.5
  24. 78
  25. 49.5
  26. 370
  27. 8.4
  28. 82.5
  29. 1.3
  30. 5.8
  31. 100
  32. 37.5
  33. 6
  34. 2
  35. 165
  36. 4.5
  37. 212.5
  38. 87
  39. 64
  40. 5

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