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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 450 · 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. 1.25% of 350 =
  2. 2.1% of 640 =
  3. 3.25% of 340 =
  4. 4.20% of 600 =
  5. 5.25% of 190 =
  6. 6.10% of 260 =
  7. 7.25% of 620 =
  8. 8.5% of 420 =
  9. 9.10% of 380 =
  10. 10.10% of 170 =
  11. 11.25% of 580 =
  12. 12.15% of 760 =
  13. 13.1% of 140 =
  14. 14.10% of 780 =
  15. 15.1% of 70 =
  16. 16.15% of 410 =
  17. 17.15% of 50 =
  18. 18.25% of 460 =
  19. 19.10% of 510 =
  20. 20.25% of 500 =
  21. 21.5% of 40 =
  22. 22.25% of 320 =
  23. 23.50% of 470 =
  24. 24.20% of 30 =
  25. 25.5% of 170 =
  26. 26.15% of 670 =
  27. 27.5% of 120 =
  28. 28.10% of 830 =
  29. 29.1% of 730 =
  30. 30.20% of 430 =
  31. 31.1% of 610 =
  32. 32.10% of 300 =
  33. 33.1% of 130 =
  34. 34.5% of 500 =
  35. 35.20% of 530 =
  36. 36.5% of 200 =
  37. 37.10% of 390 =
  38. 38.10% of 150 =
  39. 39.25% of 460 =
  40. 40.5% of 120 =

Answer key

  1. 87.5
  2. 6.4
  3. 85
  4. 120
  5. 47.5
  6. 26
  7. 155
  8. 21
  9. 38
  10. 17
  11. 145
  12. 114
  13. 1.4
  14. 78
  15. 0.7
  16. 61.5
  17. 7.5
  18. 115
  19. 51
  20. 125
  21. 2
  22. 80
  23. 235
  24. 6
  25. 8.5
  26. 100.5
  27. 6
  28. 83
  29. 7.3
  30. 86
  31. 6.1
  32. 30
  33. 1.3
  34. 25
  35. 106
  36. 10
  37. 39
  38. 15
  39. 115
  40. 6

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