Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 459 · 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. 1.150 decreased by 12% =
2. 2.680 increased by 10% =
3. 3.120 decreased by 5% =
4. 4.256 increased by 25% =
5. 5.725 increased by 8% =
6. 6.780 increased by 15% =
7. 7.360 increased by 10% =
8. 8.740 increased by 10% =
9. 9.560 increased by 75% =
10. 10.330 increased by 50% =
11. 11.680 increased by 5% =
12. 12.45 increased by 20% =
13. 13.400 increased by 50% =
14. 14.640 increased by 35% =
15. 15.400 decreased by 12% =
16. 16.748 increased by 50% =
17. 17.800 increased by 15% =
18. 18.350 decreased by 20% =
19. 19.640 increased by 5% =
20. 20.396 increased by 50% =
21. 21.775 increased by 12% =
22. 22.510 increased by 10% =
23. 23.340 decreased by 60% =
24. 24.220 decreased by 40% =
25. 25.200 decreased by 15% =
26. 26.400 increased by 5% =
27. 27.240 increased by 10% =
28. 28.605 increased by 40% =
29. 29.720 increased by 15% =
30. 30.145 increased by 40% =
31. 31.690 increased by 10% =
32. 32.796 increased by 50% =
33. 33.630 decreased by 30% =
34. 34.510 decreased by 30% =
35. 35.215 increased by 40% =
36. 36.444 decreased by 25% =
37. 37.620 decreased by 40% =
38. 38.300 increased by 60% =
39. 39.170 increased by 30% =
40. 40.345 decreased by 40% =

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