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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 635 · 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 20 =
  2. 2.50% of 840 =
  3. 3.10% of 600 =
  4. 4.1% of 40 =
  5. 5.10% of 820 =
  6. 6.50% of 520 =
  7. 7.50% of 100 =
  8. 8.10% of 110 =
  9. 9.50% of 330 =
  10. 10.20% of 170 =
  11. 11.1% of 270 =
  12. 12.15% of 620 =
  13. 13.15% of 900 =
  14. 14.5% of 420 =
  15. 15.15% of 720 =
  16. 16.10% of 320 =
  17. 17.5% of 510 =
  18. 18.25% of 830 =
  19. 19.25% of 270 =
  20. 20.25% of 660 =
  21. 21.5% of 420 =
  22. 22.5% of 770 =
  23. 23.10% of 660 =
  24. 24.20% of 40 =
  25. 25.20% of 260 =
  26. 26.20% of 700 =
  27. 27.25% of 100 =
  28. 28.25% of 360 =
  29. 29.1% of 100 =
  30. 30.20% of 60 =
  31. 31.10% of 120 =
  32. 32.5% of 870 =
  33. 33.5% of 520 =
  34. 34.25% of 800 =
  35. 35.20% of 850 =
  36. 36.5% of 670 =
  37. 37.1% of 530 =
  38. 38.50% of 740 =
  39. 39.10% of 50 =
  40. 40.15% of 290 =

Answer key

  1. 2
  2. 420
  3. 60
  4. 0.4
  5. 82
  6. 260
  7. 50
  8. 11
  9. 165
  10. 34
  11. 2.7
  12. 93
  13. 135
  14. 21
  15. 108
  16. 32
  17. 25.5
  18. 207.5
  19. 67.5
  20. 165
  21. 21
  22. 38.5
  23. 66
  24. 8
  25. 52
  26. 140
  27. 25
  28. 90
  29. 1
  30. 12
  31. 12
  32. 43.5
  33. 26
  34. 200
  35. 170
  36. 33.5
  37. 5.3
  38. 370
  39. 5
  40. 43.5

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