Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 74 · 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. 2.620 increased by 40% =
3. 3.460 decreased by 35% =
4. 4.480 increased by 10% =
5. 5.572 decreased by 25% =
6. 6.240 increased by 15% =
7. 7.160 decreased by 5% =
8. 8.268 increased by 75% =
9. 9.140 decreased by 5% =
10. 10.175 decreased by 12% =
11. 11.100 decreased by 5% =
12. 12.464 increased by 75% =
13. 13.560 decreased by 35% =
14. 14.225 increased by 12% =
15. 15.150 increased by 20% =
16. 16.220 increased by 10% =
17. 17.120 decreased by 15% =
18. 18.280 decreased by 5% =
19. 19.280 decreased by 5% =
20. 20.130 increased by 10% =
21. 21.600 increased by 8% =
22. 22.750 decreased by 40% =
23. 23.800 decreased by 15% =
24. 24.260 decreased by 60% =
25. 25.720 decreased by 5% =
26. 26.120 increased by 5% =
27. 27.568 decreased by 25% =
28. 28.180 decreased by 15% =
29. 29.300 decreased by 8% =
30. 30.550 decreased by 8% =
31. 31.610 increased by 30% =
32. 32.700 increased by 60% =
33. 33.320 increased by 5% =
34. 34.625 decreased by 20% =
35. 35.375 increased by 8% =
36. 36.60 increased by 35% =
37. 37.325 decreased by 20% =
38. 38.164 decreased by 75% =
39. 39.100 increased by 30% =
40. 40.435 increased by 20% =

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