Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 91 · 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. 1.225 increased by 8% =
2. 2.700 decreased by 5% =
3. 3.690 increased by 10% =
4. 4.408 increased by 25% =
5. 5.580 increased by 20% =
6. 6.490 increased by 10% =
7. 7.120 increased by 15% =
8. 8.175 decreased by 12% =
9. 9.580 increased by 40% =
10. 10.40 decreased by 30% =
11. 11.220 increased by 10% =
12. 12.256 increased by 75% =
13. 13.40 decreased by 40% =
14. 14.670 decreased by 20% =
15. 15.535 increased by 20% =
16. 16.400 decreased by 8% =
17. 17.400 increased by 30% =
18. 18.60 increased by 5% =
19. 19.720 decreased by 15% =
20. 20.248 increased by 50% =
21. 21.80 decreased by 5% =
22. 22.204 decreased by 75% =
23. 23.500 increased by 15% =
24. 24.180 increased by 35% =
25. 25.148 decreased by 25% =
26. 26.245 decreased by 40% =
27. 27.272 decreased by 25% =
28. 28.492 increased by 50% =
29. 29.710 increased by 10% =
30. 30.720 decreased by 60% =
31. 31.310 decreased by 30% =
32. 32.44 increased by 25% =
33. 33.240 decreased by 10% =
34. 34.465 decreased by 60% =
35. 35.280 decreased by 5% =
36. 36.415 decreased by 20% =
37. 37.750 increased by 60% =
38. 38.140 decreased by 10% =
39. 39.490 increased by 20% =
40. 40.175 increased by 12% =

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