Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 190 · 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. 1.290 decreased by 30% =
2. 2.700 increased by 10% =
3. 3.788 increased by 25% =
4. 4.200 increased by 5% =
5. 5.712 increased by 75% =
6. 6.50 increased by 30% =
7. 7.175 increased by 8% =
8. 8.120 decreased by 5% =
9. 9.256 increased by 25% =
10. 10.308 decreased by 75% =
11. 11.620 decreased by 60% =
12. 12.220 increased by 40% =
13. 13.490 increased by 10% =
14. 14.550 decreased by 60% =
15. 15.80 decreased by 10% =
16. 16.275 decreased by 40% =
17. 17.300 decreased by 8% =
18. 18.330 decreased by 20% =
19. 19.360 increased by 5% =
20. 20.585 increased by 60% =
21. 21.225 decreased by 40% =
22. 22.416 decreased by 75% =
23. 23.268 decreased by 75% =
24. 24.450 decreased by 30% =
25. 25.780 decreased by 75% =
26. 26.615 increased by 20% =
27. 27.325 decreased by 8% =
28. 28.380 decreased by 15% =
29. 29.680 decreased by 30% =
30. 30.750 decreased by 20% =
31. 31.470 decreased by 30% =
32. 32.290 decreased by 10% =
33. 33.340 decreased by 30% =
34. 34.500 increased by 10% =
35. 35.525 decreased by 12% =
36. 36.130 decreased by 60% =
37. 37.140 increased by 35% =
38. 38.110 increased by 20% =
39. 39.540 increased by 35% =
40. 40.215 decreased by 20% =

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