Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 879 · 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. 1.305 increased by 20% =
2. 2.700 decreased by 8% =
3. 3.710 increased by 30% =
4. 4.475 decreased by 8% =
5. 5.780 decreased by 10% =
6. 6.690 decreased by 10% =
7. 7.625 increased by 20% =
8. 8.140 decreased by 40% =
9. 9.650 increased by 12% =
10. 10.60 increased by 20% =
11. 11.100 decreased by 35% =
12. 12.670 increased by 30% =
13. 13.575 increased by 8% =
14. 14.356 decreased by 75% =
15. 15.620 increased by 10% =
16. 16.225 decreased by 8% =
17. 17.740 decreased by 5% =
18. 18.380 decreased by 5% =
19. 19.444 increased by 75% =
20. 20.420 increased by 5% =
21. 21.780 increased by 10% =
22. 22.288 increased by 75% =
23. 23.390 decreased by 30% =
24. 24.530 increased by 30% =
25. 25.670 increased by 10% =
26. 26.220 increased by 35% =
27. 27.660 increased by 20% =
28. 28.676 decreased by 25% =
29. 29.754 decreased by 50% =
30. 30.620 increased by 40% =
31. 31.490 decreased by 20% =
32. 32.380 increased by 5% =
33. 33.480 decreased by 50% =
34. 34.200 decreased by 12% =
35. 35.328 increased by 50% =
36. 36.210 decreased by 10% =
37. 37.788 decreased by 25% =
38. 38.600 increased by 35% =
39. 39.648 decreased by 25% =
40. 40.720 increased by 5% =

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