Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 266 · 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. 1.580 decreased by 15% =
2. 2.680 increased by 15% =
3. 3.750 decreased by 12% =
4. 4.768 decreased by 75% =
5. 5.160 increased by 10% =
6. 6.296 increased by 25% =
7. 7.600 increased by 8% =
8. 8.785 increased by 40% =
9. 9.620 decreased by 75% =
10. 10.460 decreased by 25% =
11. 11.450 decreased by 12% =
12. 12.554 increased by 50% =
13. 13.660 decreased by 25% =
14. 14.450 increased by 50% =
15. 15.675 increased by 12% =
16. 16.200 increased by 30% =
17. 17.120 increased by 10% =
18. 18.635 increased by 20% =
19. 19.360 increased by 10% =
20. 20.460 increased by 40% =
21. 21.340 decreased by 35% =
22. 22.220 increased by 5% =
23. 23.420 increased by 35% =
24. 24.635 decreased by 40% =
25. 25.240 increased by 15% =
26. 26.50 increased by 12% =
27. 27.430 decreased by 30% =
28. 28.200 decreased by 12% =
29. 29.160 increased by 60% =
30. 30.710 decreased by 10% =
31. 31.792 increased by 50% =
32. 32.508 increased by 75% =
33. 33.650 increased by 30% =
34. 34.700 decreased by 8% =
35. 35.764 decreased by 25% =
36. 36.495 increased by 20% =
37. 37.548 increased by 25% =
38. 38.60 increased by 10% =
39. 39.320 increased by 20% =
40. 40.660 increased by 30% =

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