Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 543 · 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. 1.56 decreased by 75% =
2. 2.150 decreased by 8% =
3. 3.430 increased by 30% =
4. 4.170 decreased by 30% =
5. 5.110 increased by 50% =
6. 6.760 decreased by 15% =
7. 7.40 decreased by 20% =
8. 8.425 increased by 40% =
9. 9.216 increased by 50% =
10. 10.492 decreased by 75% =
11. 11.465 decreased by 40% =
12. 12.300 decreased by 12% =
13. 13.240 increased by 5% =
14. 14.520 decreased by 15% =
15. 15.590 decreased by 30% =
16. 16.450 decreased by 40% =
17. 17.325 decreased by 12% =
18. 18.180 decreased by 5% =
19. 19.360 increased by 60% =
20. 20.515 increased by 20% =
21. 21.348 increased by 75% =
22. 22.560 decreased by 5% =
23. 23.235 decreased by 20% =
24. 24.545 decreased by 60% =
25. 25.448 decreased by 25% =
26. 26.280 decreased by 75% =
27. 27.492 increased by 75% =
28. 28.700 increased by 12% =
29. 29.720 increased by 60% =
30. 30.745 decreased by 20% =
31. 31.565 increased by 60% =
32. 32.410 increased by 10% =
33. 33.150 increased by 10% =
34. 34.40 increased by 10% =
35. 35.140 decreased by 35% =
36. 36.500 increased by 8% =
37. 37.708 increased by 25% =
38. 38.226 increased by 50% =
39. 39.275 increased by 12% =
40. 40.150 increased by 40% =

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