Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 329 · 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. 1.360 decreased by 30% =
2. 2.540 decreased by 5% =
3. 3.250 increased by 8% =
4. 4.360 decreased by 15% =
5. 5.140 increased by 35% =
6. 6.320 increased by 35% =
7. 7.175 increased by 12% =
8. 8.780 increased by 5% =
9. 9.150 decreased by 30% =
10. 10.50 increased by 8% =
11. 11.760 increased by 10% =
12. 12.96 increased by 50% =
13. 13.300 increased by 12% =
14. 14.308 increased by 25% =
15. 15.720 increased by 15% =
16. 16.540 increased by 5% =
17. 17.570 increased by 10% =
18. 18.416 increased by 25% =
19. 19.40 increased by 15% =
20. 20.250 increased by 10% =
21. 21.670 increased by 30% =
22. 22.670 decreased by 10% =
23. 23.452 decreased by 75% =
24. 24.570 decreased by 30% =
25. 25.315 decreased by 40% =
26. 26.120 decreased by 15% =
27. 27.260 increased by 5% =
28. 28.40 increased by 35% =
29. 29.540 increased by 25% =
30. 30.620 increased by 10% =
31. 31.300 decreased by 15% =
32. 32.596 decreased by 25% =
33. 33.440 increased by 5% =
34. 34.530 decreased by 60% =
35. 35.420 increased by 10% =
36. 36.450 increased by 8% =
37. 37.125 decreased by 12% =
38. 38.498 increased by 50% =
39. 39.505 increased by 40% =
40. 40.690 increased by 10% =

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