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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 145 · 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 550 =
  2. 2.15% of 720 =
  3. 3.5% of 830 =
  4. 4.20% of 700 =
  5. 5.25% of 540 =
  6. 6.15% of 270 =
  7. 7.50% of 720 =
  8. 8.10% of 270 =
  9. 9.15% of 600 =
  10. 10.15% of 400 =
  11. 11.20% of 640 =
  12. 12.5% of 20 =
  13. 13.15% of 710 =
  14. 14.50% of 150 =
  15. 15.20% of 200 =
  16. 16.15% of 760 =
  17. 17.5% of 750 =
  18. 18.5% of 880 =
  19. 19.50% of 220 =
  20. 20.10% of 570 =
  21. 21.20% of 210 =
  22. 22.25% of 580 =
  23. 23.50% of 510 =
  24. 24.20% of 400 =
  25. 25.20% of 550 =
  26. 26.10% of 80 =
  27. 27.20% of 90 =
  28. 28.1% of 270 =
  29. 29.50% of 50 =
  30. 30.50% of 240 =
  31. 31.15% of 780 =
  32. 32.5% of 830 =
  33. 33.25% of 60 =
  34. 34.15% of 140 =
  35. 35.50% of 630 =
  36. 36.1% of 170 =
  37. 37.5% of 60 =
  38. 38.1% of 890 =
  39. 39.1% of 550 =
  40. 40.50% of 730 =

Answer key

  1. 137.5
  2. 108
  3. 41.5
  4. 140
  5. 135
  6. 40.5
  7. 360
  8. 27
  9. 90
  10. 60
  11. 128
  12. 1
  13. 106.5
  14. 75
  15. 40
  16. 114
  17. 37.5
  18. 44
  19. 110
  20. 57
  21. 42
  22. 145
  23. 255
  24. 80
  25. 110
  26. 8
  27. 18
  28. 2.7
  29. 25
  30. 120
  31. 117
  32. 41.5
  33. 15
  34. 21
  35. 315
  36. 1.7
  37. 3
  38. 8.9
  39. 5.5
  40. 365

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