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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 457 · 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. 1.50% of 810 =
  2. 2.25% of 300 =
  3. 3.15% of 550 =
  4. 4.10% of 490 =
  5. 5.25% of 890 =
  6. 6.50% of 810 =
  7. 7.20% of 220 =
  8. 8.5% of 510 =
  9. 9.15% of 620 =
  10. 10.10% of 510 =
  11. 11.15% of 510 =
  12. 12.15% of 780 =
  13. 13.1% of 250 =
  14. 14.50% of 610 =
  15. 15.5% of 470 =
  16. 16.10% of 850 =
  17. 17.1% of 270 =
  18. 18.25% of 840 =
  19. 19.15% of 670 =
  20. 20.50% of 410 =
  21. 21.25% of 130 =
  22. 22.20% of 70 =
  23. 23.1% of 20 =
  24. 24.20% of 280 =
  25. 25.20% of 710 =
  26. 26.10% of 710 =
  27. 27.5% of 150 =
  28. 28.1% of 710 =
  29. 29.1% of 20 =
  30. 30.5% of 670 =
  31. 31.10% of 310 =
  32. 32.25% of 380 =
  33. 33.25% of 100 =
  34. 34.1% of 870 =
  35. 35.1% of 110 =
  36. 36.50% of 310 =
  37. 37.5% of 860 =
  38. 38.15% of 550 =
  39. 39.5% of 500 =
  40. 40.1% of 840 =

Answer key

  1. 405
  2. 75
  3. 82.5
  4. 49
  5. 222.5
  6. 405
  7. 44
  8. 25.5
  9. 93
  10. 51
  11. 76.5
  12. 117
  13. 2.5
  14. 305
  15. 23.5
  16. 85
  17. 2.7
  18. 210
  19. 100.5
  20. 205
  21. 32.5
  22. 14
  23. 0.2
  24. 56
  25. 142
  26. 71
  27. 7.5
  28. 7.1
  29. 0.2
  30. 33.5
  31. 31
  32. 95
  33. 25
  34. 8.7
  35. 1.1
  36. 155
  37. 43
  38. 82.5
  39. 25
  40. 8.4

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