Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 225 · 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. 1.620 decreased by 15% =
2. 2.285 decreased by 60% =
3. 3.48 increased by 75% =
4. 4.380 increased by 15% =
5. 5.50 increased by 12% =
6. 6.380 increased by 10% =
7. 7.700 increased by 10% =
8. 8.350 increased by 8% =
9. 9.560 increased by 5% =
10. 10.200 decreased by 12% =
11. 11.500 increased by 8% =
12. 12.140 increased by 10% =
13. 13.800 increased by 10% =
14. 14.790 decreased by 20% =
15. 15.160 decreased by 15% =
16. 16.400 increased by 35% =
17. 17.288 decreased by 75% =
18. 18.175 decreased by 8% =
19. 19.760 decreased by 35% =
20. 20.775 decreased by 8% =
21. 21.350 increased by 8% =
22. 22.160 decreased by 10% =
23. 23.760 decreased by 40% =
24. 24.668 increased by 25% =
25. 25.616 decreased by 75% =
26. 26.415 increased by 20% =
27. 27.150 decreased by 60% =
28. 28.300 increased by 12% =
29. 29.180 increased by 40% =
30. 30.400 decreased by 15% =
31. 31.555 decreased by 60% =
32. 32.110 increased by 40% =
33. 33.464 decreased by 50% =
34. 34.555 increased by 20% =
35. 35.360 decreased by 35% =
36. 36.290 decreased by 40% =
37. 37.410 increased by 30% =
38. 38.220 decreased by 35% =
39. 39.65 increased by 60% =
40. 40.232 increased by 75% =

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