Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 750 · 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. 1.580 decreased by 35% =
2. 2.90 increased by 60% =
3. 3.530 decreased by 60% =
4. 4.275 increased by 12% =
5. 5.350 increased by 10% =
6. 6.230 increased by 60% =
7. 7.120 increased by 35% =
8. 8.645 decreased by 60% =
9. 9.380 increased by 15% =
10. 10.310 decreased by 30% =
11. 11.410 decreased by 30% =
12. 12.100 increased by 12% =
13. 13.504 decreased by 25% =
14. 14.60 increased by 15% =
15. 15.408 increased by 25% =
16. 16.225 increased by 12% =
17. 17.395 increased by 40% =
18. 18.385 increased by 60% =
19. 19.180 decreased by 15% =
20. 20.210 increased by 30% =
21. 21.460 decreased by 15% =
22. 22.124 decreased by 75% =
23. 23.40 increased by 35% =
24. 24.444 decreased by 75% =
25. 25.702 increased by 50% =
26. 26.114 increased by 50% =
27. 27.200 increased by 15% =
28. 28.440 increased by 5% =
29. 29.750 decreased by 12% =
30. 30.710 decreased by 30% =
31. 31.240 decreased by 30% =
32. 32.478 decreased by 50% =
33. 33.430 decreased by 40% =
34. 34.100 decreased by 15% =
35. 35.300 increased by 35% =
36. 36.155 increased by 60% =
37. 37.80 increased by 35% =
38. 38.340 decreased by 5% =
39. 39.800 increased by 5% =
40. 40.560 increased by 60% =

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