Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 470 · 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. 1.306 decreased by 50% =
2. 2.570 decreased by 10% =
3. 3.375 decreased by 8% =
4. 4.570 increased by 30% =
5. 5.540 increased by 5% =
6. 6.240 increased by 60% =
7. 7.776 increased by 50% =
8. 8.625 increased by 8% =
9. 9.425 increased by 12% =
10. 10.375 decreased by 12% =
11. 11.210 increased by 50% =
12. 12.575 increased by 60% =
13. 13.350 decreased by 12% =
14. 14.728 decreased by 25% =
15. 15.100 decreased by 8% =
16. 16.340 decreased by 20% =
17. 17.320 increased by 35% =
18. 18.680 increased by 15% =
19. 19.140 decreased by 15% =
20. 20.300 decreased by 12% =
21. 21.380 decreased by 35% =
22. 22.610 decreased by 20% =
23. 23.410 decreased by 20% =
24. 24.420 increased by 30% =
25. 25.404 decreased by 25% =
26. 26.475 increased by 8% =
27. 27.180 decreased by 35% =
28. 28.725 increased by 12% =
29. 29.580 increased by 10% =
30. 30.480 decreased by 5% =
31. 31.800 increased by 12% =
32. 32.364 increased by 50% =
33. 33.655 decreased by 60% =
34. 34.510 decreased by 30% =
35. 35.160 decreased by 15% =
36. 36.100 decreased by 5% =
37. 37.620 decreased by 40% =
38. 38.270 increased by 60% =
39. 39.100 increased by 8% =
40. 40.300 decreased by 30% =

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