Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 486 · 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. 1.275 increased by 20% =
2. 2.572 decreased by 75% =
3. 3.88 decreased by 75% =
4. 4.180 increased by 25% =
5. 5.85 decreased by 20% =
6. 6.120 decreased by 20% =
7. 7.525 decreased by 12% =
8. 8.150 increased by 40% =
9. 9.450 increased by 10% =
10. 10.560 increased by 15% =
11. 11.292 decreased by 25% =
12. 12.390 decreased by 50% =
13. 13.576 decreased by 75% =
14. 14.260 increased by 75% =
15. 15.120 increased by 35% =
16. 16.365 increased by 20% =
17. 17.712 increased by 25% =
18. 18.292 decreased by 75% =
19. 19.472 decreased by 50% =
20. 20.80 increased by 60% =
21. 21.460 increased by 5% =
22. 22.440 decreased by 60% =
23. 23.716 increased by 75% =
24. 24.660 decreased by 15% =
25. 25.180 decreased by 5% =
26. 26.175 decreased by 12% =
27. 27.365 decreased by 20% =
28. 28.150 increased by 60% =
29. 29.510 decreased by 60% =
30. 30.520 increased by 10% =
31. 31.180 decreased by 10% =
32. 32.296 increased by 75% =
33. 33.650 increased by 10% =
34. 34.528 increased by 75% =
35. 35.728 increased by 50% =
36. 36.720 decreased by 35% =
37. 37.480 decreased by 25% =
38. 38.212 decreased by 25% =
39. 39.125 decreased by 20% =
40. 40.316 increased by 75% =

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