Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 585 · 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. 1.275 decreased by 12% =
2. 2.100 increased by 30% =
3. 3.280 decreased by 15% =
4. 4.340 decreased by 15% =
5. 5.80 increased by 10% =
6. 6.260 increased by 35% =
7. 7.550 decreased by 8% =
8. 8.140 increased by 20% =
9. 9.650 decreased by 10% =
10. 10.245 increased by 40% =
11. 11.180 increased by 5% =
12. 12.350 increased by 8% =
13. 13.90 increased by 30% =
14. 14.648 increased by 75% =
15. 15.750 decreased by 30% =
16. 16.490 increased by 10% =
17. 17.136 decreased by 25% =
18. 18.330 increased by 10% =
19. 19.500 increased by 5% =
20. 20.202 increased by 50% =
21. 21.170 increased by 60% =
22. 22.185 decreased by 20% =
23. 23.500 increased by 12% =
24. 24.144 increased by 50% =
25. 25.275 increased by 8% =
26. 26.364 decreased by 25% =
27. 27.55 decreased by 40% =
28. 28.670 increased by 10% =
29. 29.475 decreased by 8% =
30. 30.360 increased by 10% =
31. 31.550 increased by 30% =
32. 32.536 decreased by 25% =
33. 33.150 increased by 8% =
34. 34.580 decreased by 5% =
35. 35.692 increased by 75% =
36. 36.260 increased by 30% =
37. 37.525 decreased by 12% =
38. 38.340 increased by 5% =
39. 39.240 decreased by 5% =
40. 40.600 decreased by 8% =

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