Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 628 · 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. 1.415 decreased by 40% =
2. 2.260 increased by 15% =
3. 3.610 increased by 60% =
4. 4.140 increased by 5% =
5. 5.780 increased by 5% =
6. 6.510 increased by 10% =
7. 7.200 decreased by 12% =
8. 8.395 increased by 40% =
9. 9.140 decreased by 35% =
10. 10.320 decreased by 5% =
11. 11.56 increased by 75% =
12. 12.300 decreased by 15% =
13. 13.75 decreased by 20% =
14. 14.672 decreased by 25% =
15. 15.770 increased by 30% =
16. 16.200 increased by 35% =
17. 17.620 increased by 35% =
18. 18.520 decreased by 50% =
19. 19.475 increased by 12% =
20. 20.220 increased by 15% =
21. 21.575 increased by 12% =
22. 22.275 increased by 12% =
23. 23.660 decreased by 30% =
24. 24.310 decreased by 30% =
25. 25.340 increased by 10% =
26. 26.160 increased by 5% =
27. 27.575 increased by 40% =
28. 28.170 decreased by 10% =
29. 29.465 decreased by 20% =
30. 30.740 increased by 15% =
31. 31.108 decreased by 75% =
32. 32.100 decreased by 35% =
33. 33.175 decreased by 40% =
34. 34.170 decreased by 10% =
35. 35.545 increased by 20% =
36. 36.464 decreased by 50% =
37. 37.680 increased by 10% =
38. 38.216 increased by 25% =
39. 39.240 decreased by 5% =
40. 40.160 decreased by 10% =

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