Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 422 · 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. 1.125 increased by 12% =
2. 2.760 decreased by 60% =
3. 3.110 increased by 10% =
4. 4.220 increased by 10% =
5. 5.255 decreased by 60% =
6. 6.620 increased by 75% =
7. 7.400 decreased by 8% =
8. 8.200 decreased by 30% =
9. 9.770 decreased by 30% =
10. 10.700 increased by 15% =
11. 11.152 increased by 75% =
12. 12.360 decreased by 5% =
13. 13.800 decreased by 12% =
14. 14.168 increased by 75% =
15. 15.40 increased by 60% =
16. 16.250 increased by 10% =
17. 17.388 increased by 25% =
18. 18.440 increased by 10% =
19. 19.400 decreased by 35% =
20. 20.700 decreased by 10% =
21. 21.260 decreased by 35% =
22. 22.225 increased by 12% =
23. 23.180 increased by 35% =
24. 24.400 increased by 40% =
25. 25.235 increased by 60% =
26. 26.720 increased by 30% =
27. 27.616 increased by 25% =
28. 28.250 increased by 30% =
29. 29.570 decreased by 30% =
30. 30.670 increased by 60% =
31. 31.140 decreased by 10% =
32. 32.256 decreased by 75% =
33. 33.700 increased by 15% =
34. 34.700 increased by 25% =
35. 35.240 increased by 5% =
36. 36.520 increased by 35% =
37. 37.400 decreased by 30% =
38. 38.655 increased by 40% =
39. 39.460 increased by 5% =
40. 40.440 increased by 15% =

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