Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 745 · 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. 1.775 decreased by 8% =
2. 2.440 decreased by 35% =
3. 3.75 increased by 20% =
4. 4.60 decreased by 5% =
5. 5.656 increased by 25% =
6. 6.325 decreased by 12% =
7. 7.730 decreased by 40% =
8. 8.420 increased by 35% =
9. 9.470 decreased by 10% =
10. 10.140 decreased by 25% =
11. 11.730 increased by 30% =
12. 12.265 decreased by 20% =
13. 13.770 decreased by 30% =
14. 14.600 increased by 15% =
15. 15.434 increased by 50% =
16. 16.368 increased by 25% =
17. 17.750 increased by 8% =
18. 18.375 decreased by 60% =
19. 19.60 decreased by 35% =
20. 20.55 increased by 40% =
21. 21.640 decreased by 35% =
22. 22.600 decreased by 8% =
23. 23.195 decreased by 60% =
24. 24.135 decreased by 20% =
25. 25.200 decreased by 15% =
26. 26.500 increased by 8% =
27. 27.60 increased by 5% =
28. 28.780 increased by 30% =
29. 29.524 increased by 75% =
30. 30.320 increased by 60% =
31. 31.716 decreased by 25% =
32. 32.300 increased by 15% =
33. 33.276 increased by 25% =
34. 34.135 increased by 60% =
35. 35.80 increased by 5% =
36. 36.40 increased by 30% =
37. 37.364 decreased by 75% =
38. 38.655 increased by 20% =
39. 39.520 decreased by 35% =
40. 40.625 increased by 20% =

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