Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 175 · 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. 1.700 decreased by 30% =
2. 2.304 increased by 50% =
3. 3.85 decreased by 60% =
4. 4.300 increased by 12% =
5. 5.770 decreased by 20% =
6. 6.800 decreased by 15% =
7. 7.550 decreased by 12% =
8. 8.365 decreased by 20% =
9. 9.240 decreased by 30% =
10. 10.700 decreased by 12% =
11. 11.710 increased by 30% =
12. 12.140 decreased by 5% =
13. 13.230 decreased by 30% =
14. 14.125 increased by 12% =
15. 15.750 decreased by 40% =
16. 16.440 increased by 5% =
17. 17.635 decreased by 60% =
18. 18.70 increased by 60% =
19. 19.60 increased by 20% =
20. 20.750 decreased by 8% =
21. 21.710 decreased by 60% =
22. 22.560 decreased by 40% =
23. 23.300 decreased by 30% =
24. 24.580 increased by 25% =
25. 25.240 decreased by 40% =
26. 26.276 increased by 25% =
27. 27.656 increased by 75% =
28. 28.506 decreased by 50% =
29. 29.750 decreased by 10% =
30. 30.580 decreased by 5% =
31. 31.515 decreased by 20% =
32. 32.88 increased by 25% =
33. 33.676 decreased by 50% =
34. 34.640 decreased by 35% =
35. 35.450 increased by 30% =
36. 36.125 increased by 12% =
37. 37.560 decreased by 10% =
38. 38.600 increased by 35% =
39. 39.305 increased by 60% =
40. 40.540 increased by 25% =

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