Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 120 · 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. 1.750 increased by 40% =
2. 2.256 decreased by 75% =
3. 3.120 increased by 30% =
4. 4.800 increased by 30% =
5. 5.50 decreased by 50% =
6. 6.180 increased by 75% =
7. 7.484 decreased by 25% =
8. 8.90 decreased by 10% =
9. 9.552 increased by 75% =
10. 10.410 increased by 30% =
11. 11.400 decreased by 25% =
12. 12.180 increased by 10% =
13. 13.640 decreased by 15% =
14. 14.150 increased by 8% =
15. 15.692 decreased by 75% =
16. 16.104 increased by 50% =
17. 17.145 increased by 20% =
18. 18.160 decreased by 10% =
19. 19.40 decreased by 5% =
20. 20.475 increased by 8% =
21. 21.425 increased by 12% =
22. 22.625 increased by 20% =
23. 23.200 increased by 5% =
24. 24.520 increased by 30% =
25. 25.718 increased by 50% =
26. 26.196 decreased by 50% =
27. 27.300 decreased by 35% =
28. 28.680 increased by 20% =
29. 29.160 decreased by 60% =
30. 30.440 increased by 30% =
31. 31.180 increased by 30% =
32. 32.100 decreased by 35% =
33. 33.200 increased by 12% =
34. 34.460 decreased by 15% =
35. 35.708 decreased by 50% =
36. 36.444 increased by 50% =
37. 37.780 increased by 30% =
38. 38.375 increased by 60% =
39. 39.720 increased by 5% =
40. 40.256 decreased by 75% =

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