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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 120 · 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 480 =
  2. 2.1% of 240 =
  3. 3.50% of 530 =
  4. 4.20% of 430 =
  5. 5.1% of 340 =
  6. 6.10% of 830 =
  7. 7.5% of 700 =
  8. 8.50% of 70 =
  9. 9.5% of 610 =
  10. 10.10% of 730 =
  11. 11.25% of 400 =
  12. 12.50% of 640 =
  13. 13.20% of 400 =
  14. 14.50% of 230 =
  15. 15.5% of 690 =
  16. 16.10% of 90 =
  17. 17.10% of 760 =
  18. 18.20% of 120 =
  19. 19.20% of 80 =
  20. 20.5% of 110 =
  21. 21.50% of 310 =
  22. 22.25% of 510 =
  23. 23.50% of 190 =
  24. 24.25% of 220 =
  25. 25.10% of 850 =
  26. 26.1% of 340 =
  27. 27.50% of 280 =
  28. 28.1% of 430 =
  29. 29.50% of 750 =
  30. 30.15% of 280 =
  31. 31.50% of 230 =
  32. 32.50% of 740 =
  33. 33.20% of 250 =
  34. 34.1% of 200 =
  35. 35.50% of 300 =
  36. 36.50% of 420 =
  37. 37.15% of 610 =
  38. 38.5% of 390 =
  39. 39.5% of 730 =
  40. 40.5% of 250 =

Answer key

  1. 120
  2. 2.4
  3. 265
  4. 86
  5. 3.4
  6. 83
  7. 35
  8. 35
  9. 30.5
  10. 73
  11. 100
  12. 320
  13. 80
  14. 115
  15. 34.5
  16. 9
  17. 76
  18. 24
  19. 16
  20. 5.5
  21. 155
  22. 127.5
  23. 95
  24. 55
  25. 85
  26. 3.4
  27. 140
  28. 4.3
  29. 375
  30. 42
  31. 115
  32. 370
  33. 50
  34. 2
  35. 150
  36. 210
  37. 91.5
  38. 19.5
  39. 36.5
  40. 12.5

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