Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 87 · 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. 1.775 increased by 20% =
2. 2.540 increased by 75% =
3. 3.540 decreased by 35% =
4. 4.180 decreased by 35% =
5. 5.670 increased by 30% =
6. 6.350 decreased by 12% =
7. 7.260 increased by 20% =
8. 8.620 decreased by 40% =
9. 9.550 increased by 12% =
10. 10.250 decreased by 12% =
11. 11.375 decreased by 8% =
12. 12.510 decreased by 30% =
13. 13.604 increased by 75% =
14. 14.700 decreased by 40% =
15. 15.750 increased by 10% =
16. 16.760 decreased by 75% =
17. 17.384 decreased by 25% =
18. 18.300 increased by 12% =
19. 19.200 increased by 30% =
20. 20.650 decreased by 12% =
21. 21.66 decreased by 50% =
22. 22.545 decreased by 40% =
23. 23.550 increased by 20% =
24. 24.544 increased by 50% =
25. 25.790 increased by 60% =
26. 26.350 decreased by 40% =
27. 27.150 increased by 12% =
28. 28.724 increased by 75% =
29. 29.235 decreased by 20% =
30. 30.568 increased by 50% =
31. 31.540 decreased by 10% =
32. 32.780 decreased by 30% =
33. 33.285 decreased by 60% =
34. 34.460 increased by 75% =
35. 35.220 increased by 15% =
36. 36.275 increased by 20% =
37. 37.800 decreased by 35% =
38. 38.425 increased by 12% =
39. 39.156 increased by 75% =
40. 40.160 increased by 30% =

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