Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 309 · 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. 1.125 decreased by 12% =
2. 2.75 increased by 8% =
3. 3.55 decreased by 40% =
4. 4.80 decreased by 10% =
5. 5.460 increased by 60% =
6. 6.525 decreased by 12% =
7. 7.200 decreased by 30% =
8. 8.300 increased by 12% =
9. 9.40 increased by 15% =
10. 10.110 decreased by 40% =
11. 11.430 increased by 20% =
12. 12.80 decreased by 15% =
13. 13.382 increased by 50% =
14. 14.220 increased by 35% =
15. 15.350 decreased by 8% =
16. 16.775 decreased by 12% =
17. 17.250 increased by 8% =
18. 18.784 decreased by 75% =
19. 19.800 increased by 15% =
20. 20.125 decreased by 8% =
21. 21.712 increased by 50% =
22. 22.60 increased by 60% =
23. 23.500 increased by 30% =
24. 24.756 increased by 50% =
25. 25.615 increased by 40% =
26. 26.650 decreased by 8% =
27. 27.440 increased by 5% =
28. 28.600 increased by 8% =
29. 29.492 increased by 75% =
30. 30.545 increased by 20% =
31. 31.310 decreased by 30% =
32. 32.800 increased by 5% =
33. 33.280 increased by 15% =
34. 34.320 decreased by 30% =
35. 35.360 decreased by 30% =
36. 36.290 increased by 40% =
37. 37.510 decreased by 10% =
38. 38.520 increased by 5% =
39. 39.60 increased by 15% =
40. 40.760 increased by 75% =

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