Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 915 · 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. 1.125 decreased by 40% =
2. 2.135 increased by 60% =
3. 3.690 decreased by 30% =
4. 4.80 decreased by 5% =
5. 5.710 increased by 20% =
6. 6.125 increased by 20% =
7. 7.735 increased by 60% =
8. 8.124 increased by 50% =
9. 9.588 decreased by 75% =
10. 10.200 decreased by 35% =
11. 11.410 decreased by 30% =
12. 12.500 decreased by 8% =
13. 13.800 increased by 8% =
14. 14.360 increased by 35% =
15. 15.656 decreased by 25% =
16. 16.445 increased by 40% =
17. 17.560 increased by 10% =
18. 18.168 increased by 25% =
19. 19.625 increased by 40% =
20. 20.698 increased by 50% =
21. 21.160 increased by 15% =
22. 22.550 increased by 12% =
23. 23.450 decreased by 10% =
24. 24.250 increased by 10% =
25. 25.585 increased by 60% =
26. 26.70 increased by 10% =
27. 27.800 increased by 8% =
28. 28.80 decreased by 75% =
29. 29.660 decreased by 60% =
30. 30.560 decreased by 40% =
31. 31.500 decreased by 5% =
32. 32.55 decreased by 20% =
33. 33.200 increased by 5% =
34. 34.320 increased by 10% =
35. 35.280 increased by 15% =
36. 36.440 increased by 5% =
37. 37.160 increased by 15% =
38. 38.350 decreased by 30% =
39. 39.775 increased by 8% =
40. 40.750 decreased by 8% =

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