Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 625 · 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. 1.480 decreased by 30% =
2. 2.772 increased by 25% =
3. 3.730 decreased by 10% =
4. 4.220 decreased by 5% =
5. 5.775 decreased by 20% =
6. 6.80 increased by 5% =
7. 7.325 increased by 8% =
8. 8.380 decreased by 10% =
9. 9.320 decreased by 5% =
10. 10.56 increased by 75% =
11. 11.305 increased by 60% =
12. 12.155 decreased by 20% =
13. 13.740 increased by 60% =
14. 14.98 decreased by 50% =
15. 15.184 increased by 50% =
16. 16.170 increased by 10% =
17. 17.380 increased by 60% =
18. 18.456 decreased by 25% =
19. 19.200 decreased by 35% =
20. 20.240 increased by 5% =
21. 21.60 decreased by 30% =
22. 22.264 decreased by 75% =
23. 23.776 increased by 50% =
24. 24.270 decreased by 20% =
25. 25.584 increased by 25% =
26. 26.325 decreased by 8% =
27. 27.480 increased by 5% =
28. 28.150 increased by 20% =
29. 29.285 decreased by 60% =
30. 30.250 decreased by 40% =
31. 31.350 decreased by 30% =
32. 32.450 decreased by 10% =
33. 33.245 increased by 20% =
34. 34.390 increased by 50% =
35. 35.496 increased by 25% =
36. 36.760 increased by 40% =
37. 37.260 increased by 10% =
38. 38.460 increased by 15% =
39. 39.108 decreased by 75% =
40. 40.90 decreased by 20% =

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