Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 400 · 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. 1.300 decreased by 5% =
2. 2.665 increased by 40% =
3. 3.250 increased by 12% =
4. 4.395 increased by 20% =
5. 5.792 increased by 50% =
6. 6.570 decreased by 10% =
7. 7.556 increased by 25% =
8. 8.340 increased by 15% =
9. 9.575 decreased by 8% =
10. 10.800 increased by 5% =
11. 11.88 decreased by 25% =
12. 12.660 increased by 35% =
13. 13.508 decreased by 50% =
14. 14.556 increased by 75% =
15. 15.380 increased by 15% =
16. 16.460 decreased by 30% =
17. 17.320 decreased by 5% =
18. 18.224 increased by 25% =
19. 19.620 increased by 60% =
20. 20.180 decreased by 35% =
21. 21.714 decreased by 50% =
22. 22.160 increased by 5% =
23. 23.360 decreased by 20% =
24. 24.644 increased by 75% =
25. 25.560 increased by 5% =
26. 26.285 increased by 60% =
27. 27.380 decreased by 20% =
28. 28.75 increased by 12% =
29. 29.695 increased by 60% =
30. 30.185 increased by 20% =
31. 31.340 increased by 5% =
32. 32.450 increased by 8% =
33. 33.460 increased by 35% =
34. 34.400 decreased by 35% =
35. 35.790 increased by 40% =
36. 36.340 increased by 15% =
37. 37.90 increased by 40% =
38. 38.175 decreased by 40% =
39. 39.200 increased by 40% =
40. 40.620 increased by 15% =

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