Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 391 · 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. 1.600 decreased by 5% =
2. 2.250 increased by 8% =
3. 3.730 increased by 50% =
4. 4.580 increased by 35% =
5. 5.75 increased by 12% =
6. 6.68 increased by 75% =
7. 7.75 decreased by 40% =
8. 8.200 increased by 35% =
9. 9.70 increased by 30% =
10. 10.160 increased by 15% =
11. 11.760 decreased by 15% =
12. 12.275 increased by 8% =
13. 13.300 decreased by 5% =
14. 14.540 increased by 5% =
15. 15.500 increased by 12% =
16. 16.650 increased by 12% =
17. 17.230 decreased by 40% =
18. 18.260 decreased by 15% =
19. 19.680 decreased by 15% =
20. 20.225 decreased by 8% =
21. 21.400 decreased by 5% =
22. 22.316 increased by 25% =
23. 23.765 increased by 40% =
24. 24.740 increased by 30% =
25. 25.565 increased by 20% =
26. 26.220 increased by 35% =
27. 27.185 decreased by 60% =
28. 28.140 increased by 10% =
29. 29.680 decreased by 35% =
30. 30.340 decreased by 15% =
31. 31.325 decreased by 60% =
32. 32.550 increased by 8% =
33. 33.710 decreased by 10% =
34. 34.535 decreased by 20% =
35. 35.260 decreased by 35% =
36. 36.662 decreased by 50% =
37. 37.420 increased by 75% =
38. 38.175 decreased by 8% =
39. 39.116 increased by 75% =
40. 40.175 increased by 12% =

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