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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 621 · 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. 1.20% of 140 =
  2. 2.10% of 330 =
  3. 3.50% of 710 =
  4. 4.15% of 270 =
  5. 5.1% of 130 =
  6. 6.20% of 230 =
  7. 7.50% of 590 =
  8. 8.1% of 350 =
  9. 9.10% of 120 =
  10. 10.5% of 220 =
  11. 11.25% of 140 =
  12. 12.1% of 210 =
  13. 13.1% of 890 =
  14. 14.1% of 190 =
  15. 15.20% of 510 =
  16. 16.10% of 270 =
  17. 17.15% of 680 =
  18. 18.10% of 570 =
  19. 19.15% of 640 =
  20. 20.25% of 610 =
  21. 21.10% of 900 =
  22. 22.50% of 310 =
  23. 23.50% of 80 =
  24. 24.10% of 300 =
  25. 25.25% of 170 =
  26. 26.20% of 790 =
  27. 27.20% of 420 =
  28. 28.20% of 550 =
  29. 29.5% of 630 =
  30. 30.50% of 380 =
  31. 31.15% of 50 =
  32. 32.10% of 200 =
  33. 33.1% of 60 =
  34. 34.1% of 750 =
  35. 35.1% of 590 =
  36. 36.1% of 510 =
  37. 37.10% of 630 =
  38. 38.1% of 170 =
  39. 39.5% of 50 =
  40. 40.15% of 650 =

Answer key

  1. 28
  2. 33
  3. 355
  4. 40.5
  5. 1.3
  6. 46
  7. 295
  8. 3.5
  9. 12
  10. 11
  11. 35
  12. 2.1
  13. 8.9
  14. 1.9
  15. 102
  16. 27
  17. 102
  18. 57
  19. 96
  20. 152.5
  21. 90
  22. 155
  23. 40
  24. 30
  25. 42.5
  26. 158
  27. 84
  28. 110
  29. 31.5
  30. 190
  31. 7.5
  32. 20
  33. 0.6
  34. 7.5
  35. 5.9
  36. 5.1
  37. 63
  38. 1.7
  39. 2.5
  40. 97.5

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