Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 592 · 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. 1.625 increased by 12% =
2. 2.530 increased by 10% =
3. 3.215 increased by 20% =
4. 4.580 decreased by 15% =
5. 5.136 decreased by 25% =
6. 6.675 increased by 8% =
7. 7.40 decreased by 40% =
8. 8.720 decreased by 10% =
9. 9.140 increased by 10% =
10. 10.770 decreased by 10% =
11. 11.380 decreased by 10% =
12. 12.170 increased by 20% =
13. 13.100 decreased by 5% =
14. 14.340 increased by 35% =
15. 15.640 decreased by 15% =
16. 16.700 increased by 10% =
17. 17.195 decreased by 40% =
18. 18.508 increased by 25% =
19. 19.460 increased by 5% =
20. 20.352 decreased by 75% =
21. 21.40 increased by 75% =
22. 22.710 increased by 20% =
23. 23.675 decreased by 12% =
24. 24.222 decreased by 50% =
25. 25.245 increased by 20% =
26. 26.150 decreased by 40% =
27. 27.120 decreased by 5% =
28. 28.165 decreased by 40% =
29. 29.270 increased by 50% =
30. 30.725 increased by 8% =
31. 31.310 decreased by 30% =
32. 32.750 decreased by 8% =
33. 33.475 decreased by 12% =
34. 34.695 increased by 20% =
35. 35.210 decreased by 50% =
36. 36.720 decreased by 35% =
37. 37.448 decreased by 25% =
38. 38.60 decreased by 35% =
39. 39.720 decreased by 10% =
40. 40.790 increased by 20% =

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