Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 539 · 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. 1.560 decreased by 35% =
2. 2.250 increased by 8% =
3. 3.556 decreased by 50% =
4. 4.220 increased by 5% =
5. 5.555 decreased by 60% =
6. 6.690 increased by 10% =
7. 7.768 increased by 25% =
8. 8.736 decreased by 25% =
9. 9.50 increased by 60% =
10. 10.80 decreased by 25% =
11. 11.420 increased by 10% =
12. 12.400 decreased by 8% =
13. 13.470 increased by 20% =
14. 14.240 decreased by 15% =
15. 15.175 increased by 20% =
16. 16.248 increased by 75% =
17. 17.564 increased by 25% =
18. 18.684 increased by 75% =
19. 19.795 decreased by 40% =
20. 20.220 increased by 15% =
21. 21.240 decreased by 5% =
22. 22.225 increased by 8% =
23. 23.540 increased by 15% =
24. 24.440 decreased by 25% =
25. 25.260 increased by 10% =
26. 26.530 increased by 20% =
27. 27.260 increased by 5% =
28. 28.620 decreased by 5% =
29. 29.620 increased by 25% =
30. 30.400 increased by 15% =
31. 31.325 decreased by 12% =
32. 32.100 increased by 8% =
33. 33.300 increased by 15% =
34. 34.330 increased by 10% =
35. 35.300 increased by 20% =
36. 36.585 increased by 40% =
37. 37.330 decreased by 40% =
38. 38.792 increased by 25% =
39. 39.275 increased by 12% =
40. 40.260 increased by 50% =

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