Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 253 · 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. 1.180 decreased by 10% =
2. 2.360 decreased by 15% =
3. 3.232 decreased by 25% =
4. 4.335 decreased by 40% =
5. 5.85 decreased by 60% =
6. 6.150 decreased by 10% =
7. 7.600 increased by 35% =
8. 8.388 increased by 50% =
9. 9.132 increased by 75% =
10. 10.670 increased by 30% =
11. 11.360 decreased by 35% =
12. 12.425 increased by 8% =
13. 13.320 increased by 35% =
14. 14.775 decreased by 12% =
15. 15.425 increased by 12% =
16. 16.185 decreased by 60% =
17. 17.745 decreased by 20% =
18. 18.770 decreased by 20% =
19. 19.690 decreased by 60% =
20. 20.722 decreased by 50% =
21. 21.660 decreased by 5% =
22. 22.150 increased by 8% =
23. 23.100 increased by 5% =
24. 24.180 increased by 35% =
25. 25.750 increased by 40% =
26. 26.125 decreased by 8% =
27. 27.770 increased by 20% =
28. 28.120 decreased by 35% =
29. 29.780 increased by 10% =
30. 30.360 decreased by 35% =
31. 31.675 decreased by 8% =
32. 32.560 increased by 10% =
33. 33.270 increased by 50% =
34. 34.150 decreased by 12% =
35. 35.475 decreased by 8% =
36. 36.660 decreased by 15% =
37. 37.760 decreased by 35% =
38. 38.470 increased by 60% =
39. 39.720 decreased by 15% =
40. 40.315 increased by 20% =

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