Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 171 · 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. 1.80 increased by 30% =
2. 2.325 decreased by 12% =
3. 3.800 decreased by 12% =
4. 4.470 decreased by 30% =
5. 5.578 decreased by 50% =
6. 6.660 decreased by 5% =
7. 7.525 increased by 8% =
8. 8.520 increased by 35% =
9. 9.440 increased by 35% =
10. 10.716 decreased by 25% =
11. 11.352 increased by 25% =
12. 12.80 increased by 30% =
13. 13.720 decreased by 35% =
14. 14.380 increased by 15% =
15. 15.788 increased by 75% =
16. 16.654 decreased by 50% =
17. 17.560 decreased by 35% =
18. 18.584 increased by 75% =
19. 19.165 decreased by 60% =
20. 20.360 increased by 15% =
21. 21.154 decreased by 50% =
22. 22.560 increased by 5% =
23. 23.365 increased by 20% =
24. 24.100 decreased by 15% =
25. 25.425 increased by 12% =
26. 26.520 decreased by 35% =
27. 27.225 increased by 12% =
28. 28.325 decreased by 8% =
29. 29.448 increased by 75% =
30. 30.40 increased by 40% =
31. 31.200 increased by 15% =
32. 32.660 increased by 15% =
33. 33.485 increased by 20% =
34. 34.70 decreased by 40% =
35. 35.505 increased by 20% =
36. 36.130 increased by 10% =
37. 37.50 decreased by 8% =
38. 38.188 decreased by 50% =
39. 39.240 increased by 40% =
40. 40.260 increased by 15% =

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