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Percentage Worksheet – Mental Maths

Speed calculation lesson 12: Percentages in seconds · Set 421 · 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 430 =
  2. 2.50% of 630 =
  3. 3.5% of 330 =
  4. 4.20% of 890 =
  5. 5.1% of 890 =
  6. 6.10% of 490 =
  7. 7.15% of 340 =
  8. 8.1% of 540 =
  9. 9.25% of 760 =
  10. 10.25% of 340 =
  11. 11.5% of 570 =
  12. 12.50% of 520 =
  13. 13.20% of 890 =
  14. 14.1% of 210 =
  15. 15.15% of 690 =
  16. 16.5% of 90 =
  17. 17.50% of 20 =
  18. 18.20% of 300 =
  19. 19.15% of 220 =
  20. 20.50% of 20 =
  21. 21.20% of 900 =
  22. 22.10% of 220 =
  23. 23.25% of 60 =
  24. 24.5% of 380 =
  25. 25.5% of 240 =
  26. 26.20% of 530 =
  27. 27.15% of 300 =
  28. 28.25% of 720 =
  29. 29.5% of 650 =
  30. 30.1% of 130 =
  31. 31.10% of 600 =
  32. 32.5% of 800 =
  33. 33.10% of 300 =
  34. 34.50% of 70 =
  35. 35.15% of 550 =
  36. 36.5% of 150 =
  37. 37.15% of 340 =
  38. 38.5% of 60 =
  39. 39.15% of 300 =
  40. 40.25% of 110 =

Answer key

  1. 43
  2. 315
  3. 16.5
  4. 178
  5. 8.9
  6. 49
  7. 51
  8. 5.4
  9. 190
  10. 85
  11. 28.5
  12. 260
  13. 178
  14. 2.1
  15. 103.5
  16. 4.5
  17. 10
  18. 60
  19. 33
  20. 10
  21. 180
  22. 22
  23. 15
  24. 19
  25. 12
  26. 106
  27. 45
  28. 180
  29. 32.5
  30. 1.3
  31. 60
  32. 40
  33. 30
  34. 35
  35. 82.5
  36. 7.5
  37. 51
  38. 3
  39. 45
  40. 27.5

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