Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 957 · 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. 1.235 increased by 40% =
2. 2.560 decreased by 40% =
3. 3.140 increased by 35% =
4. 4.120 decreased by 20% =
5. 5.732 increased by 50% =
6. 6.400 decreased by 75% =
7. 7.660 increased by 25% =
8. 8.260 increased by 5% =
9. 9.680 increased by 35% =
10. 10.680 decreased by 35% =
11. 11.330 increased by 40% =
12. 12.364 decreased by 50% =
13. 13.464 decreased by 75% =
14. 14.390 decreased by 50% =
15. 15.230 increased by 60% =
16. 16.236 increased by 25% =
17. 17.260 increased by 20% =
18. 18.210 decreased by 30% =
19. 19.775 increased by 12% =
20. 20.450 increased by 10% =
21. 21.500 increased by 10% =
22. 22.772 increased by 25% =
23. 23.475 decreased by 8% =
24. 24.410 decreased by 60% =
25. 25.612 increased by 75% =
26. 26.425 decreased by 8% =
27. 27.280 decreased by 5% =
28. 28.670 decreased by 30% =
29. 29.675 decreased by 12% =
30. 30.210 decreased by 30% =
31. 31.800 increased by 15% =
32. 32.640 increased by 15% =
33. 33.440 increased by 15% =
34. 34.625 decreased by 8% =
35. 35.170 decreased by 10% =
36. 36.320 decreased by 15% =
37. 37.525 increased by 12% =
38. 38.400 increased by 25% =
39. 39.460 increased by 30% =
40. 40.630 increased by 30% =

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