Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 718 · 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. 1.280 decreased by 10% =
2. 2.788 decreased by 75% =
3. 3.520 decreased by 35% =
4. 4.180 decreased by 60% =
5. 5.146 decreased by 50% =
6. 6.140 increased by 15% =
7. 7.90 increased by 10% =
8. 8.112 increased by 75% =
9. 9.242 increased by 50% =
10. 10.196 decreased by 50% =
11. 11.540 increased by 30% =
12. 12.792 increased by 50% =
13. 13.605 increased by 40% =
14. 14.760 decreased by 30% =
15. 15.400 increased by 8% =
16. 16.260 decreased by 35% =
17. 17.200 increased by 35% =
18. 18.670 decreased by 40% =
19. 19.60 increased by 15% =
20. 20.160 increased by 30% =
21. 21.720 increased by 5% =
22. 22.425 increased by 12% =
23. 23.60 decreased by 60% =
24. 24.640 decreased by 35% =
25. 25.540 decreased by 10% =
26. 26.640 increased by 40% =
27. 27.590 increased by 40% =
28. 28.590 decreased by 30% =
29. 29.90 increased by 40% =
30. 30.280 increased by 35% =
31. 31.782 increased by 50% =
32. 32.650 decreased by 40% =
33. 33.364 decreased by 50% =
34. 34.150 increased by 30% =
35. 35.560 increased by 30% =
36. 36.560 decreased by 15% =
37. 37.670 increased by 10% =
38. 38.80 decreased by 20% =
39. 39.720 increased by 75% =
40. 40.100 increased by 75% =

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