Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 878 · 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. 1.520 decreased by 5% =
2. 2.225 increased by 12% =
3. 3.424 decreased by 25% =
4. 4.550 increased by 12% =
5. 5.444 increased by 25% =
6. 6.752 decreased by 25% =
7. 7.500 increased by 35% =
8. 8.360 increased by 15% =
9. 9.350 decreased by 10% =
10. 10.240 decreased by 15% =
11. 11.56 decreased by 25% =
12. 12.120 increased by 40% =
13. 13.400 decreased by 5% =
14. 14.690 decreased by 30% =
15. 15.470 decreased by 10% =
16. 16.478 increased by 50% =
17. 17.360 increased by 15% =
18. 18.170 decreased by 50% =
19. 19.468 decreased by 50% =
20. 20.80 increased by 10% =
21. 21.160 increased by 15% =
22. 22.200 increased by 10% =
23. 23.640 decreased by 60% =
24. 24.224 increased by 25% =
25. 25.780 increased by 35% =
26. 26.674 increased by 50% =
27. 27.275 increased by 20% =
28. 28.208 decreased by 50% =
29. 29.560 decreased by 50% =
30. 30.584 decreased by 75% =
31. 31.215 increased by 20% =
32. 32.140 increased by 15% =
33. 33.430 increased by 10% =
34. 34.545 increased by 40% =
35. 35.288 decreased by 50% =
36. 36.160 increased by 40% =
37. 37.440 decreased by 20% =
38. 38.594 increased by 50% =
39. 39.735 increased by 60% =
40. 40.650 increased by 8% =

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