Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 218 · 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. 1.555 decreased by 60% =
2. 2.760 decreased by 75% =
3. 3.68 increased by 25% =
4. 4.180 increased by 5% =
5. 5.800 increased by 30% =
6. 6.445 increased by 60% =
7. 7.460 decreased by 35% =
8. 8.610 decreased by 30% =
9. 9.540 increased by 10% =
10. 10.232 decreased by 75% =
11. 11.68 decreased by 25% =
12. 12.795 increased by 60% =
13. 13.535 increased by 60% =
14. 14.520 decreased by 10% =
15. 15.420 increased by 15% =
16. 16.745 decreased by 40% =
17. 17.476 increased by 25% =
18. 18.388 decreased by 25% =
19. 19.675 decreased by 12% =
20. 20.580 decreased by 5% =
21. 21.100 increased by 15% =
22. 22.645 increased by 20% =
23. 23.130 increased by 30% =
24. 24.605 decreased by 60% =
25. 25.380 increased by 15% =
26. 26.700 increased by 5% =
27. 27.544 decreased by 25% =
28. 28.285 decreased by 40% =
29. 29.145 increased by 60% =
30. 30.445 increased by 60% =
31. 31.740 increased by 5% =
32. 32.110 decreased by 10% =
33. 33.460 decreased by 10% =
34. 34.320 decreased by 5% =
35. 35.445 decreased by 20% =
36. 36.125 increased by 8% =
37. 37.40 increased by 15% =
38. 38.610 increased by 10% =
39. 39.170 increased by 50% =
40. 40.275 increased by 8% =

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