Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 347 · 40 questions

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.

1. 1.280 decreased by 15% =
2. 2.250 increased by 60% =
3. 3.184 increased by 25% =
4. 4.800 increased by 12% =
5. 5.180 increased by 35% =
6. 6.60 increased by 10% =
7. 7.120 decreased by 50% =
8. 8.200 increased by 35% =
9. 9.120 decreased by 5% =
10. 10.115 decreased by 60% =
11. 11.636 decreased by 50% =
12. 12.325 increased by 20% =
13. 13.216 decreased by 25% =
14. 14.402 increased by 50% =
15. 15.790 increased by 10% =
16. 16.330 decreased by 50% =
17. 17.380 increased by 15% =
18. 18.450 increased by 8% =
19. 19.560 decreased by 5% =
20. 20.150 decreased by 30% =
21. 21.356 decreased by 25% =
22. 22.750 decreased by 8% =
23. 23.375 decreased by 12% =
24. 24.320 increased by 15% =
25. 25.485 decreased by 40% =
26. 26.776 increased by 25% =
27. 27.420 decreased by 40% =
28. 28.550 decreased by 12% =
29. 29.700 increased by 40% =
30. 30.558 decreased by 50% =
31. 31.448 decreased by 75% =
32. 32.800 decreased by 5% =
33. 33.356 decreased by 25% =
34. 34.352 increased by 75% =
35. 35.110 increased by 60% =
36. 36.370 increased by 30% =
37. 37.312 increased by 25% =
38. 38.440 decreased by 75% =
39. 39.200 increased by 60% =
40. 40.555 increased by 20% =

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