Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 911 · 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. 1.415 decreased by 40% =
2. 2.720 decreased by 30% =
3. 3.350 increased by 8% =
4. 4.248 increased by 75% =
5. 5.740 increased by 30% =
6. 6.404 increased by 75% =
7. 7.315 increased by 20% =
8. 8.136 increased by 50% =
9. 9.576 decreased by 25% =
10. 10.475 decreased by 8% =
11. 11.704 decreased by 75% =
12. 12.660 decreased by 25% =
13. 13.300 increased by 15% =
14. 14.480 increased by 15% =
15. 15.388 decreased by 25% =
16. 16.130 decreased by 10% =
17. 17.50 increased by 12% =
18. 18.280 increased by 10% =
19. 19.125 decreased by 12% =
20. 20.635 decreased by 20% =
21. 21.760 increased by 15% =
22. 22.300 increased by 12% =
23. 23.190 decreased by 50% =
24. 24.72 increased by 50% =
25. 25.550 increased by 8% =
26. 26.400 decreased by 5% =
27. 27.90 decreased by 30% =
28. 28.580 increased by 30% =
29. 29.400 increased by 8% =
30. 30.148 decreased by 25% =
31. 31.228 decreased by 50% =
32. 32.640 decreased by 25% =
33. 33.192 decreased by 25% =
34. 34.170 decreased by 10% =
35. 35.292 decreased by 25% =
36. 36.256 increased by 50% =
37. 37.750 increased by 12% =
38. 38.440 increased by 15% =
39. 39.365 decreased by 20% =
40. 40.745 decreased by 20% =

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