Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 571 · 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. 1.575 increased by 12% =
2. 2.770 increased by 20% =
3. 3.118 decreased by 50% =
4. 4.575 decreased by 12% =
5. 5.290 decreased by 60% =
6. 6.175 decreased by 8% =
7. 7.204 decreased by 50% =
8. 8.800 increased by 12% =
9. 9.688 decreased by 25% =
10. 10.370 decreased by 10% =
11. 11.710 decreased by 10% =
12. 12.475 increased by 12% =
13. 13.500 decreased by 15% =
14. 14.260 increased by 10% =
15. 15.280 increased by 25% =
16. 16.355 increased by 20% =
17. 17.180 decreased by 15% =
18. 18.650 increased by 30% =
19. 19.105 decreased by 20% =
20. 20.160 increased by 5% =
21. 21.120 increased by 30% =
22. 22.305 decreased by 60% =
23. 23.320 increased by 10% =
24. 24.125 decreased by 60% =
25. 25.125 increased by 12% =
26. 26.200 decreased by 15% =
27. 27.400 increased by 15% =
28. 28.150 increased by 30% =
29. 29.770 increased by 10% =
30. 30.620 decreased by 5% =
31. 31.470 decreased by 20% =
32. 32.740 increased by 15% =
33. 33.260 decreased by 40% =
34. 34.540 increased by 25% =
35. 35.165 increased by 60% =
36. 36.100 decreased by 8% =
37. 37.540 decreased by 25% =
38. 38.240 decreased by 15% =
39. 39.712 increased by 75% =
40. 40.460 increased by 35% =

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