Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 283 · 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. 1.180 decreased by 5% =
2. 2.380 decreased by 10% =
3. 3.120 decreased by 15% =
4. 4.160 decreased by 35% =
5. 5.220 decreased by 15% =
6. 6.440 increased by 35% =
7. 7.600 increased by 35% =
8. 8.440 decreased by 5% =
9. 9.684 decreased by 25% =
10. 10.180 increased by 75% =
11. 11.275 decreased by 12% =
12. 12.40 decreased by 35% =
13. 13.640 increased by 35% =
14. 14.780 decreased by 15% =
15. 15.250 increased by 30% =
16. 16.300 increased by 12% =
17. 17.348 decreased by 25% =
18. 18.80 decreased by 15% =
19. 19.544 increased by 50% =
20. 20.130 increased by 10% =
21. 21.260 decreased by 75% =
22. 22.300 decreased by 75% =
23. 23.160 increased by 35% =
24. 24.750 decreased by 12% =
25. 25.40 increased by 15% =
26. 26.300 decreased by 12% =
27. 27.600 increased by 30% =
28. 28.560 increased by 30% =
29. 29.260 decreased by 15% =
30. 30.280 decreased by 60% =
31. 31.460 increased by 35% =
32. 32.468 decreased by 25% =
33. 33.288 decreased by 75% =
34. 34.565 increased by 20% =
35. 35.412 decreased by 75% =
36. 36.544 decreased by 25% =
37. 37.235 increased by 40% =
38. 38.350 increased by 8% =
39. 39.290 increased by 30% =
40. 40.150 decreased by 12% =

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