Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 211 · 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. 1.160 increased by 15% =
2. 2.720 decreased by 30% =
3. 3.484 decreased by 75% =
4. 4.68 increased by 25% =
5. 5.780 increased by 5% =
6. 6.800 decreased by 8% =
7. 7.250 increased by 30% =
8. 8.360 decreased by 15% =
9. 9.540 decreased by 15% =
10. 10.270 increased by 10% =
11. 11.580 decreased by 35% =
12. 12.470 increased by 20% =
13. 13.140 increased by 30% =
14. 14.780 increased by 15% =
15. 15.420 increased by 10% =
16. 16.480 decreased by 25% =
17. 17.286 decreased by 50% =
18. 18.180 decreased by 10% =
19. 19.380 decreased by 5% =
20. 20.98 increased by 50% =
21. 21.720 decreased by 30% =
22. 22.595 decreased by 20% =
23. 23.170 decreased by 30% =
24. 24.700 decreased by 5% =
25. 25.725 increased by 12% =
26. 26.175 decreased by 8% =
27. 27.328 increased by 75% =
28. 28.800 increased by 15% =
29. 29.175 decreased by 8% =
30. 30.575 decreased by 60% =
31. 31.220 increased by 5% =
32. 32.520 increased by 10% =
33. 33.440 increased by 5% =
34. 34.720 increased by 35% =
35. 35.610 decreased by 10% =
36. 36.710 decreased by 50% =
37. 37.388 decreased by 75% =
38. 38.40 decreased by 5% =
39. 39.750 increased by 40% =
40. 40.520 increased by 25% =

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