Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 2 · 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. 1.370 increased by 50% =
2. 2.160 decreased by 30% =
3. 3.720 decreased by 15% =
4. 4.660 decreased by 15% =
5. 5.760 decreased by 5% =
6. 6.200 decreased by 30% =
7. 7.116 decreased by 25% =
8. 8.100 decreased by 15% =
9. 9.570 decreased by 60% =
10. 10.495 increased by 20% =
11. 11.365 increased by 20% =
12. 12.250 decreased by 12% =
13. 13.400 increased by 5% =
14. 14.570 decreased by 30% =
15. 15.575 increased by 60% =
16. 16.780 decreased by 25% =
17. 17.160 decreased by 10% =
18. 18.184 increased by 50% =
19. 19.120 increased by 5% =
20. 20.220 increased by 15% =
21. 21.240 decreased by 5% =
22. 22.690 decreased by 30% =
23. 23.360 increased by 5% =
24. 24.40 increased by 10% =
25. 25.630 decreased by 60% =
26. 26.88 increased by 75% =
27. 27.100 decreased by 12% =
28. 28.775 increased by 8% =
29. 29.540 increased by 35% =
30. 30.600 decreased by 35% =
31. 31.650 decreased by 8% =
32. 32.368 decreased by 75% =
33. 33.625 decreased by 8% =
34. 34.320 decreased by 20% =
35. 35.100 increased by 20% =
36. 36.790 increased by 60% =
37. 37.120 increased by 35% =
38. 38.136 decreased by 25% =
39. 39.250 decreased by 60% =
40. 40.316 increased by 75% =

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