Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 382 · 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. 1.460 decreased by 10% =
2. 2.390 decreased by 10% =
3. 3.415 increased by 20% =
4. 4.670 increased by 40% =
5. 5.450 increased by 12% =
6. 6.275 increased by 12% =
7. 7.775 increased by 8% =
8. 8.240 increased by 35% =
9. 9.610 decreased by 10% =
10. 10.420 increased by 35% =
11. 11.675 increased by 12% =
12. 12.796 increased by 25% =
13. 13.285 decreased by 60% =
14. 14.640 increased by 35% =
15. 15.460 decreased by 15% =
16. 16.220 increased by 10% =
17. 17.680 increased by 20% =
18. 18.360 decreased by 15% =
19. 19.630 decreased by 20% =
20. 20.140 increased by 50% =
21. 21.710 decreased by 10% =
22. 22.356 decreased by 75% =
23. 23.488 increased by 75% =
24. 24.368 decreased by 25% =
25. 25.150 increased by 12% =
26. 26.325 increased by 60% =
27. 27.375 decreased by 8% =
28. 28.130 increased by 10% =
29. 29.560 increased by 40% =
30. 30.420 increased by 60% =
31. 31.60 increased by 35% =
32. 32.280 increased by 10% =
33. 33.80 increased by 40% =
34. 34.668 decreased by 50% =
35. 35.250 increased by 8% =
36. 36.325 decreased by 12% =
37. 37.325 decreased by 40% =
38. 38.750 increased by 8% =
39. 39.340 increased by 35% =
40. 40.500 increased by 12% =

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