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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 925 · 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 270 =
  2. 2.10% of 420 =
  3. 3.15% of 840 =
  4. 4.10% of 550 =
  5. 5.1% of 250 =
  6. 6.25% of 410 =
  7. 7.10% of 880 =
  8. 8.5% of 560 =
  9. 9.10% of 370 =
  10. 10.15% of 70 =
  11. 11.15% of 320 =
  12. 12.15% of 890 =
  13. 13.20% of 450 =
  14. 14.5% of 550 =
  15. 15.50% of 140 =
  16. 16.1% of 380 =
  17. 17.5% of 780 =
  18. 18.5% of 480 =
  19. 19.15% of 480 =
  20. 20.1% of 390 =
  21. 21.1% of 890 =
  22. 22.20% of 500 =
  23. 23.20% of 490 =
  24. 24.15% of 530 =
  25. 25.50% of 270 =
  26. 26.25% of 350 =
  27. 27.25% of 800 =
  28. 28.50% of 730 =
  29. 29.25% of 120 =
  30. 30.10% of 800 =
  31. 31.1% of 720 =
  32. 32.1% of 150 =
  33. 33.5% of 30 =
  34. 34.25% of 140 =
  35. 35.5% of 500 =
  36. 36.50% of 690 =
  37. 37.10% of 810 =
  38. 38.50% of 640 =
  39. 39.1% of 570 =
  40. 40.5% of 190 =

Answer key

  1. 13.5
  2. 42
  3. 126
  4. 55
  5. 2.5
  6. 102.5
  7. 88
  8. 28
  9. 37
  10. 10.5
  11. 48
  12. 133.5
  13. 90
  14. 27.5
  15. 70
  16. 3.8
  17. 39
  18. 24
  19. 72
  20. 3.9
  21. 8.9
  22. 100
  23. 98
  24. 79.5
  25. 135
  26. 87.5
  27. 200
  28. 365
  29. 30
  30. 80
  31. 7.2
  32. 1.5
  33. 1.5
  34. 35
  35. 25
  36. 345
  37. 81
  38. 320
  39. 5.7
  40. 9.5

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