Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 79 · 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. 1.205 decreased by 20% =
2. 2.575 increased by 8% =
3. 3.350 decreased by 8% =
4. 4.175 decreased by 8% =
5. 5.700 increased by 5% =
6. 6.710 decreased by 10% =
7. 7.400 increased by 12% =
8. 8.50 increased by 8% =
9. 9.540 increased by 20% =
10. 10.648 decreased by 25% =
11. 11.200 increased by 8% =
12. 12.100 increased by 15% =
13. 13.500 decreased by 8% =
14. 14.325 increased by 20% =
15. 15.260 decreased by 5% =
16. 16.230 increased by 20% =
17. 17.508 decreased by 50% =
18. 18.60 increased by 25% =
19. 19.340 decreased by 15% =
20. 20.700 increased by 15% =
21. 21.268 decreased by 25% =
22. 22.80 decreased by 15% =
23. 23.400 increased by 12% =
24. 24.590 increased by 30% =
25. 25.360 increased by 75% =
26. 26.165 increased by 60% =
27. 27.270 increased by 40% =
28. 28.315 increased by 20% =
29. 29.55 increased by 40% =
30. 30.500 decreased by 40% =
31. 31.235 increased by 20% =
32. 32.800 increased by 15% =
33. 33.724 increased by 75% =
34. 34.300 increased by 15% =
35. 35.700 decreased by 35% =
36. 36.95 increased by 60% =
37. 37.800 decreased by 25% =
38. 38.400 decreased by 10% =
39. 39.225 decreased by 20% =
40. 40.800 increased by 8% =

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