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Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 956 · 40 questions
TalentJR

The fast method (One-step multiplier): Increase by p%: multiply by (100 + p)% — up 20% is × 1.2. Decrease by p%: multiply by (100 − p)% — down 25% is × 0.75. Easy way to multiply: × the whole number (115 or 75), then ÷ 100.

NameDateTime takenScore ___ / 40
  1. 1.520 increased by 35% =
  2. 2.220 increased by 35% =
  3. 3.400 increased by 15% =
  4. 4.310 increased by 50% =
  5. 5.540 decreased by 35% =
  6. 6.660 increased by 15% =
  7. 7.395 increased by 20% =
  8. 8.240 increased by 15% =
  9. 9.180 decreased by 15% =
  10. 10.592 decreased by 25% =
  11. 11.640 increased by 15% =
  12. 12.320 decreased by 5% =
  13. 13.260 increased by 5% =
  14. 14.68 increased by 50% =
  15. 15.665 increased by 20% =
  16. 16.330 decreased by 30% =
  17. 17.40 increased by 35% =
  18. 18.480 increased by 5% =
  19. 19.725 increased by 20% =
  20. 20.540 decreased by 30% =
  21. 21.595 decreased by 20% =
  22. 22.50 increased by 8% =
  23. 23.480 decreased by 35% =
  24. 24.520 increased by 30% =
  25. 25.100 decreased by 60% =
  26. 26.440 decreased by 20% =
  27. 27.484 increased by 50% =
  28. 28.100 increased by 15% =
  29. 29.112 increased by 75% =
  30. 30.325 decreased by 8% =
  31. 31.300 increased by 35% =
  32. 32.400 decreased by 12% =
  33. 33.340 increased by 35% =
  34. 34.432 decreased by 75% =
  35. 35.800 increased by 5% =
  36. 36.320 decreased by 30% =
  37. 37.500 decreased by 60% =
  38. 38.400 increased by 20% =
  39. 39.225 increased by 12% =
  40. 40.475 decreased by 60% =

Answer key

  1. 702
  2. 297
  3. 460
  4. 465
  5. 351
  6. 759
  7. 474
  8. 276
  9. 153
  10. 444
  11. 736
  12. 304
  13. 273
  14. 102
  15. 798
  16. 231
  17. 54
  18. 504
  19. 870
  20. 378
  21. 476
  22. 54
  23. 312
  24. 676
  25. 40
  26. 352
  27. 726
  28. 115
  29. 196
  30. 299
  31. 405
  32. 352
  33. 459
  34. 108
  35. 840
  36. 224
  37. 200
  38. 480
  39. 252
  40. 190

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