Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 3 · 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. 1.650 increased by 12% =
2. 2.500 increased by 20% =
3. 3.328 increased by 25% =
4. 4.390 increased by 20% =
5. 5.690 increased by 30% =
6. 6.500 increased by 10% =
7. 7.64 increased by 50% =
8. 8.525 decreased by 12% =
9. 9.460 increased by 40% =
10. 10.784 increased by 50% =
11. 11.275 decreased by 8% =
12. 12.400 increased by 75% =
13. 13.710 decreased by 10% =
14. 14.40 increased by 60% =
15. 15.304 decreased by 50% =
16. 16.90 increased by 30% =
17. 17.800 increased by 30% =
18. 18.450 decreased by 50% =
19. 19.420 increased by 15% =
20. 20.580 decreased by 20% =
21. 21.180 increased by 25% =
22. 22.655 increased by 60% =
23. 23.792 decreased by 25% =
24. 24.500 increased by 12% =
25. 25.490 decreased by 10% =
26. 26.500 increased by 50% =
27. 27.570 decreased by 10% =
28. 28.246 increased by 50% =
29. 29.305 decreased by 60% =
30. 30.670 increased by 50% =
31. 31.60 decreased by 25% =
32. 32.240 increased by 75% =
33. 33.550 increased by 12% =
34. 34.572 increased by 50% =
35. 35.155 decreased by 40% =
36. 36.630 decreased by 10% =
37. 37.440 increased by 35% =
38. 38.360 decreased by 10% =
39. 39.672 decreased by 25% =
40. 40.250 increased by 12% =

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