Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 764 · 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. 1.495 increased by 20% =
2. 2.500 increased by 12% =
3. 3.175 decreased by 8% =
4. 4.156 decreased by 75% =
5. 5.548 increased by 25% =
6. 6.480 decreased by 5% =
7. 7.350 increased by 30% =
8. 8.620 increased by 50% =
9. 9.360 increased by 40% =
10. 10.520 decreased by 10% =
11. 11.615 increased by 20% =
12. 12.60 decreased by 15% =
13. 13.450 increased by 10% =
14. 14.575 decreased by 12% =
15. 15.80 decreased by 15% =
16. 16.200 increased by 35% =
17. 17.790 increased by 10% =
18. 18.300 increased by 10% =
19. 19.155 increased by 20% =
20. 20.650 increased by 12% =
21. 21.554 decreased by 50% =
22. 22.440 decreased by 5% =
23. 23.680 decreased by 15% =
24. 24.160 increased by 10% =
25. 25.540 increased by 20% =
26. 26.744 decreased by 25% =
27. 27.425 increased by 12% =
28. 28.424 increased by 25% =
29. 29.170 decreased by 10% =
30. 30.280 decreased by 20% =
31. 31.736 decreased by 75% =
32. 32.60 increased by 15% =
33. 33.530 decreased by 30% =
34. 34.175 decreased by 12% =
35. 35.220 increased by 15% =
36. 36.380 decreased by 75% =
37. 37.460 increased by 10% =
38. 38.360 increased by 15% =
39. 39.260 decreased by 5% =
40. 40.620 decreased by 15% =

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