Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 902 · 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. 1.150 increased by 12% =
2. 2.130 decreased by 20% =
3. 3.766 increased by 50% =
4. 4.675 increased by 8% =
5. 5.690 decreased by 20% =
6. 6.150 decreased by 8% =
7. 7.595 decreased by 20% =
8. 8.260 decreased by 15% =
9. 9.750 decreased by 40% =
10. 10.670 decreased by 10% =
11. 11.160 increased by 15% =
12. 12.50 decreased by 20% =
13. 13.136 decreased by 50% =
14. 14.250 increased by 30% =
15. 15.800 decreased by 25% =
16. 16.70 decreased by 50% =
17. 17.80 increased by 60% =
18. 18.575 decreased by 8% =
19. 19.224 increased by 25% =
20. 20.250 increased by 10% =
21. 21.310 decreased by 20% =
22. 22.80 increased by 5% =
23. 23.792 increased by 75% =
24. 24.680 decreased by 5% =
25. 25.315 increased by 40% =
26. 26.55 increased by 40% =
27. 27.636 increased by 50% =
28. 28.360 increased by 35% =
29. 29.230 decreased by 20% =
30. 30.650 increased by 30% =
31. 31.190 increased by 60% =
32. 32.800 decreased by 8% =
33. 33.620 increased by 5% =
34. 34.220 increased by 5% =
35. 35.520 increased by 40% =
36. 36.740 increased by 5% =
37. 37.50 increased by 10% =
38. 38.720 increased by 5% =
39. 39.650 decreased by 8% =
40. 40.645 decreased by 20% =

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