Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 792 · 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. 1.125 increased by 40% =
2. 2.380 increased by 15% =
3. 3.460 decreased by 15% =
4. 4.160 increased by 10% =
5. 5.600 increased by 35% =
6. 6.428 increased by 50% =
7. 7.670 decreased by 10% =
8. 8.585 increased by 20% =
9. 9.620 decreased by 35% =
10. 10.120 decreased by 15% =
11. 11.725 increased by 8% =
12. 12.412 increased by 50% =
13. 13.60 decreased by 15% =
14. 14.498 decreased by 50% =
15. 15.590 increased by 60% =
16. 16.180 decreased by 10% =
17. 17.398 increased by 50% =
18. 18.360 increased by 35% =
19. 19.220 increased by 15% =
20. 20.200 decreased by 30% =
21. 21.210 decreased by 10% =
22. 22.436 decreased by 50% =
23. 23.680 increased by 15% =
24. 24.636 increased by 75% =
25. 25.620 decreased by 35% =
26. 26.505 decreased by 20% =
27. 27.560 increased by 30% =
28. 28.420 increased by 5% =
29. 29.200 increased by 50% =
30. 30.215 increased by 20% =
31. 31.736 decreased by 75% =
32. 32.704 increased by 75% =
33. 33.120 decreased by 10% =
34. 34.350 increased by 12% =
35. 35.740 increased by 15% =
36. 36.700 increased by 5% =
37. 37.500 decreased by 10% =
38. 38.450 increased by 60% =
39. 39.774 increased by 50% =
40. 40.200 decreased by 8% =

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