Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 991 · 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. 1.620 increased by 25% =
2. 2.755 increased by 40% =
3. 3.700 increased by 15% =
4. 4.70 decreased by 20% =
5. 5.260 decreased by 15% =
6. 6.100 increased by 20% =
7. 7.140 decreased by 35% =
8. 8.316 increased by 25% =
9. 9.670 increased by 20% =
10. 10.155 increased by 60% =
11. 11.440 decreased by 15% =
12. 12.560 increased by 5% =
13. 13.165 increased by 20% =
14. 14.615 decreased by 40% =
15. 15.630 decreased by 10% =
16. 16.175 increased by 12% =
17. 17.700 decreased by 20% =
18. 18.460 decreased by 15% =
19. 19.625 increased by 8% =
20. 20.140 decreased by 15% =
21. 21.120 increased by 30% =
22. 22.620 increased by 35% =
23. 23.750 decreased by 12% =
24. 24.240 increased by 10% =
25. 25.72 increased by 25% =
26. 26.575 increased by 40% =
27. 27.368 decreased by 75% =
28. 28.640 decreased by 40% =
29. 29.770 decreased by 30% =
30. 30.225 increased by 40% =
31. 31.280 increased by 75% =
32. 32.225 increased by 8% =
33. 33.250 decreased by 12% =
34. 34.204 decreased by 75% =
35. 35.105 increased by 60% =
36. 36.390 decreased by 10% =
37. 37.782 increased by 50% =
38. 38.520 increased by 60% =
39. 39.160 increased by 10% =
40. 40.475 increased by 8% =

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