Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 512 · 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. 1.270 increased by 30% =
2. 2.350 decreased by 20% =
3. 3.100 decreased by 8% =
4. 4.160 increased by 30% =
5. 5.132 increased by 25% =
6. 6.560 increased by 10% =
7. 7.175 decreased by 8% =
8. 8.455 decreased by 20% =
9. 9.225 increased by 12% =
10. 10.720 increased by 10% =
11. 11.175 decreased by 20% =
12. 12.475 increased by 12% =
13. 13.750 increased by 8% =
14. 14.45 increased by 20% =
15. 15.656 increased by 75% =
16. 16.360 increased by 40% =
17. 17.180 decreased by 30% =
18. 18.380 decreased by 25% =
19. 19.710 increased by 10% =
20. 20.200 increased by 15% =
21. 21.785 decreased by 60% =
22. 22.390 decreased by 20% =
23. 23.180 increased by 15% =
24. 24.660 increased by 15% =
25. 25.440 increased by 5% =
26. 26.690 increased by 20% =
27. 27.140 decreased by 15% =
28. 28.640 decreased by 15% =
29. 29.165 decreased by 40% =
30. 30.340 increased by 40% =
31. 31.96 decreased by 25% =
32. 32.150 increased by 50% =
33. 33.220 increased by 5% =
34. 34.240 increased by 20% =
35. 35.100 increased by 15% =
36. 36.375 decreased by 8% =
37. 37.650 increased by 40% =
38. 38.75 increased by 8% =
39. 39.300 decreased by 12% =
40. 40.760 increased by 40% =

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