Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 566 · 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. 1.612 decreased by 25% =
2. 2.700 increased by 8% =
3. 3.676 decreased by 50% =
4. 4.600 increased by 12% =
5. 5.500 increased by 30% =
6. 6.780 increased by 15% =
7. 7.480 increased by 30% =
8. 8.380 increased by 5% =
9. 9.300 increased by 30% =
10. 10.420 decreased by 15% =
11. 11.475 increased by 12% =
12. 12.600 increased by 8% =
13. 13.450 increased by 10% =
14. 14.500 increased by 15% =
15. 15.220 increased by 20% =
16. 16.240 decreased by 15% =
17. 17.100 increased by 40% =
18. 18.90 decreased by 30% =
19. 19.640 increased by 15% =
20. 20.440 increased by 15% =
21. 21.500 increased by 15% =
22. 22.138 decreased by 50% =
23. 23.520 decreased by 15% =
24. 24.80 increased by 25% =
25. 25.700 increased by 12% =
26. 26.690 decreased by 30% =
27. 27.245 decreased by 40% =
28. 28.242 increased by 50% =
29. 29.636 decreased by 25% =
30. 30.690 decreased by 10% =
31. 31.200 increased by 8% =
32. 32.590 decreased by 10% =
33. 33.784 increased by 75% =
34. 34.600 decreased by 8% =
35. 35.480 increased by 15% =
36. 36.610 increased by 30% =
37. 37.145 decreased by 20% =
38. 38.125 decreased by 12% =
39. 39.550 increased by 8% =
40. 40.800 increased by 75% =

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