Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 141 · 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. 1.175 decreased by 12% =
2. 2.110 decreased by 10% =
3. 3.225 increased by 8% =
4. 4.492 decreased by 50% =
5. 5.375 increased by 12% =
6. 6.300 increased by 10% =
7. 7.535 increased by 40% =
8. 8.780 increased by 20% =
9. 9.440 increased by 15% =
10. 10.465 decreased by 60% =
11. 11.392 increased by 25% =
12. 12.168 increased by 50% =
13. 13.280 decreased by 50% =
14. 14.530 decreased by 20% =
15. 15.700 increased by 8% =
16. 16.680 increased by 5% =
17. 17.635 decreased by 20% =
18. 18.140 decreased by 30% =
19. 19.220 increased by 15% =
20. 20.485 increased by 60% =
21. 21.650 increased by 12% =
22. 22.180 decreased by 30% =
23. 23.580 increased by 60% =
24. 24.412 increased by 75% =
25. 25.405 decreased by 60% =
26. 26.508 increased by 50% =
27. 27.400 increased by 5% =
28. 28.520 increased by 15% =
29. 29.628 decreased by 50% =
30. 30.410 decreased by 10% =
31. 31.684 decreased by 25% =
32. 32.710 decreased by 60% =
33. 33.740 decreased by 35% =
34. 34.160 increased by 15% =
35. 35.125 increased by 8% =
36. 36.610 increased by 10% =
37. 37.260 increased by 30% =
38. 38.400 increased by 15% =
39. 39.200 increased by 8% =
40. 40.500 decreased by 12% =

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