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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 877 · 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. 1.5% of 400 =
  2. 2.5% of 780 =
  3. 3.20% of 890 =
  4. 4.25% of 30 =
  5. 5.50% of 680 =
  6. 6.1% of 810 =
  7. 7.5% of 820 =
  8. 8.1% of 890 =
  9. 9.5% of 710 =
  10. 10.15% of 740 =
  11. 11.15% of 80 =
  12. 12.5% of 310 =
  13. 13.20% of 740 =
  14. 14.10% of 880 =
  15. 15.15% of 560 =
  16. 16.20% of 50 =
  17. 17.10% of 130 =
  18. 18.5% of 200 =
  19. 19.25% of 900 =
  20. 20.15% of 350 =
  21. 21.5% of 510 =
  22. 22.5% of 390 =
  23. 23.15% of 510 =
  24. 24.20% of 880 =
  25. 25.25% of 460 =
  26. 26.5% of 320 =
  27. 27.25% of 690 =
  28. 28.15% of 540 =
  29. 29.20% of 570 =
  30. 30.50% of 220 =
  31. 31.5% of 850 =
  32. 32.15% of 750 =
  33. 33.15% of 440 =
  34. 34.10% of 60 =
  35. 35.5% of 90 =
  36. 36.1% of 270 =
  37. 37.5% of 510 =
  38. 38.15% of 510 =
  39. 39.10% of 610 =
  40. 40.5% of 430 =

Answer key

  1. 20
  2. 39
  3. 178
  4. 7.5
  5. 340
  6. 8.1
  7. 41
  8. 8.9
  9. 35.5
  10. 111
  11. 12
  12. 15.5
  13. 148
  14. 88
  15. 84
  16. 10
  17. 13
  18. 10
  19. 225
  20. 52.5
  21. 25.5
  22. 19.5
  23. 76.5
  24. 176
  25. 115
  26. 16
  27. 172.5
  28. 81
  29. 114
  30. 110
  31. 42.5
  32. 112.5
  33. 66
  34. 6
  35. 4.5
  36. 2.7
  37. 25.5
  38. 76.5
  39. 61
  40. 21.5

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