Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 223 · 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. 1.240 decreased by 15% =
2. 2.130 decreased by 20% =
3. 3.775 increased by 12% =
4. 4.710 increased by 10% =
5. 5.660 increased by 40% =
6. 6.110 increased by 30% =
7. 7.350 increased by 20% =
8. 8.640 increased by 30% =
9. 9.800 decreased by 20% =
10. 10.480 increased by 15% =
11. 11.360 decreased by 5% =
12. 12.286 decreased by 50% =
13. 13.795 increased by 60% =
14. 14.360 increased by 5% =
15. 15.580 increased by 30% =
16. 16.295 decreased by 40% =
17. 17.760 increased by 5% =
18. 18.454 decreased by 50% =
19. 19.615 increased by 60% =
20. 20.492 increased by 75% =
21. 21.460 increased by 35% =
22. 22.400 decreased by 5% =
23. 23.284 decreased by 50% =
24. 24.132 increased by 25% =
25. 25.580 increased by 15% =
26. 26.290 increased by 10% =
27. 27.240 increased by 30% =
28. 28.75 increased by 8% =
29. 29.320 decreased by 30% =
30. 30.600 increased by 35% =
31. 31.135 decreased by 60% =
32. 32.436 increased by 50% =
33. 33.88 decreased by 75% =
34. 34.650 increased by 50% =
35. 35.75 decreased by 8% =
36. 36.110 decreased by 10% =
37. 37.555 increased by 40% =
38. 38.765 decreased by 60% =
39. 39.160 increased by 35% =
40. 40.480 increased by 30% =

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