Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 787 · 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. 1.725 decreased by 20% =
2. 2.660 decreased by 50% =
3. 3.392 increased by 75% =
4. 4.76 decreased by 50% =
5. 5.500 decreased by 30% =
6. 6.680 increased by 25% =
7. 7.512 decreased by 25% =
8. 8.120 decreased by 10% =
9. 9.620 decreased by 15% =
10. 10.130 decreased by 40% =
11. 11.780 increased by 15% =
12. 12.724 decreased by 75% =
13. 13.260 decreased by 10% =
14. 14.500 decreased by 15% =
15. 15.40 increased by 40% =
16. 16.236 increased by 50% =
17. 17.95 decreased by 20% =
18. 18.660 increased by 35% =
19. 19.600 increased by 40% =
20. 20.500 decreased by 40% =
21. 21.765 increased by 40% =
22. 22.670 decreased by 10% =
23. 23.760 increased by 10% =
24. 24.268 increased by 25% =
25. 25.260 increased by 75% =
26. 26.200 increased by 35% =
27. 27.675 increased by 40% =
28. 28.100 decreased by 15% =
29. 29.200 increased by 35% =
30. 30.500 increased by 5% =
31. 31.425 increased by 12% =
32. 32.750 increased by 20% =
33. 33.70 decreased by 10% =
34. 34.270 decreased by 40% =
35. 35.525 decreased by 20% =
36. 36.280 increased by 15% =
37. 37.720 decreased by 15% =
38. 38.120 increased by 10% =
39. 39.340 increased by 15% =
40. 40.528 increased by 25% =

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