Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 577 · 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. 1.800 decreased by 12% =
2. 2.625 decreased by 8% =
3. 3.625 decreased by 8% =
4. 4.504 decreased by 75% =
5. 5.545 increased by 40% =
6. 6.50 decreased by 10% =
7. 7.765 decreased by 20% =
8. 8.496 increased by 50% =
9. 9.375 decreased by 20% =
10. 10.120 increased by 15% =
11. 11.360 increased by 30% =
12. 12.40 decreased by 30% =
13. 13.80 increased by 20% =
14. 14.405 increased by 60% =
15. 15.76 increased by 75% =
16. 16.600 decreased by 35% =
17. 17.640 decreased by 20% =
18. 18.516 decreased by 25% =
19. 19.205 increased by 60% =
20. 20.304 decreased by 50% =
21. 21.420 increased by 15% =
22. 22.330 increased by 10% =
23. 23.240 increased by 35% =
24. 24.525 increased by 60% =
25. 25.800 increased by 40% =
26. 26.180 increased by 5% =
27. 27.380 decreased by 35% =
28. 28.560 increased by 5% =
29. 29.500 increased by 35% =
30. 30.800 increased by 15% =
31. 31.75 decreased by 12% =
32. 32.775 increased by 60% =
33. 33.540 increased by 50% =
34. 34.440 decreased by 30% =
35. 35.400 increased by 10% =
36. 36.170 decreased by 60% =
37. 37.325 increased by 12% =
38. 38.600 decreased by 15% =
39. 39.88 decreased by 75% =
40. 40.780 increased by 15% =

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