Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 278 · 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. 1.360 increased by 35% =
2. 2.635 increased by 40% =
3. 3.496 decreased by 75% =
4. 4.248 decreased by 50% =
5. 5.100 decreased by 12% =
6. 6.568 increased by 25% =
7. 7.725 decreased by 12% =
8. 8.800 decreased by 8% =
9. 9.200 increased by 15% =
10. 10.200 decreased by 20% =
11. 11.220 increased by 20% =
12. 12.140 decreased by 15% =
13. 13.268 decreased by 25% =
14. 14.460 increased by 30% =
15. 15.390 decreased by 10% =
16. 16.300 decreased by 5% =
17. 17.355 increased by 20% =
18. 18.194 increased by 50% =
19. 19.260 increased by 75% =
20. 20.542 increased by 50% =
21. 21.140 increased by 50% =
22. 22.680 increased by 35% =
23. 23.446 increased by 50% =
24. 24.590 increased by 10% =
25. 25.604 increased by 50% =
26. 26.745 decreased by 20% =
27. 27.180 decreased by 50% =
28. 28.100 decreased by 8% =
29. 29.144 increased by 50% =
30. 30.760 increased by 40% =
31. 31.74 increased by 50% =
32. 32.100 increased by 5% =
33. 33.460 decreased by 40% =
34. 34.60 increased by 35% =
35. 35.184 decreased by 25% =
36. 36.100 increased by 40% =
37. 37.680 decreased by 35% =
38. 38.585 decreased by 40% =
39. 39.580 increased by 20% =
40. 40.406 increased by 50% =

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