Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 456 · 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. 1.320 decreased by 10% =
2. 2.525 increased by 8% =
3. 3.680 decreased by 20% =
4. 4.50 increased by 12% =
5. 5.240 decreased by 15% =
6. 6.710 increased by 10% =
7. 7.260 decreased by 35% =
8. 8.550 increased by 8% =
9. 9.570 increased by 10% =
10. 10.270 increased by 10% =
11. 11.120 decreased by 35% =
12. 12.80 decreased by 5% =
13. 13.540 decreased by 15% =
14. 14.320 increased by 5% =
15. 15.330 increased by 10% =
16. 16.760 decreased by 30% =
17. 17.390 decreased by 20% =
18. 18.325 decreased by 8% =
19. 19.100 decreased by 35% =
20. 20.220 decreased by 5% =
21. 21.80 increased by 75% =
22. 22.425 increased by 40% =
23. 23.220 decreased by 15% =
24. 24.714 decreased by 50% =
25. 25.560 increased by 30% =
26. 26.725 decreased by 12% =
27. 27.772 decreased by 25% =
28. 28.352 decreased by 75% =
29. 29.475 increased by 12% =
30. 30.490 increased by 30% =
31. 31.775 decreased by 60% =
32. 32.320 decreased by 35% =
33. 33.540 increased by 15% =
34. 34.450 increased by 12% =
35. 35.720 increased by 20% =
36. 36.365 increased by 40% =
37. 37.60 increased by 40% =
38. 38.745 increased by 60% =
39. 39.76 decreased by 75% =
40. 40.472 increased by 25% =

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