Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 83 · 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. 1.460 decreased by 35% =
2. 2.560 decreased by 35% =
3. 3.360 decreased by 35% =
4. 4.225 increased by 8% =
5. 5.600 decreased by 15% =
6. 6.620 increased by 5% =
7. 7.605 increased by 40% =
8. 8.340 increased by 35% =
9. 9.200 increased by 12% =
10. 10.500 increased by 15% =
11. 11.740 increased by 15% =
12. 12.284 increased by 50% =
13. 13.270 increased by 10% =
14. 14.600 increased by 15% =
15. 15.200 increased by 35% =
16. 16.125 decreased by 60% =
17. 17.390 decreased by 10% =
18. 18.465 decreased by 40% =
19. 19.472 increased by 25% =
20. 20.460 decreased by 15% =
21. 21.140 decreased by 50% =
22. 22.500 decreased by 20% =
23. 23.520 increased by 5% =
24. 24.210 increased by 60% =
25. 25.525 decreased by 8% =
26. 26.375 decreased by 12% =
27. 27.548 decreased by 25% =
28. 28.600 increased by 12% =
29. 29.675 increased by 12% =
30. 30.120 increased by 5% =
31. 31.680 increased by 15% =
32. 32.556 decreased by 50% =
33. 33.730 decreased by 60% =
34. 34.196 increased by 25% =
35. 35.680 increased by 35% =
36. 36.155 decreased by 20% =
37. 37.460 increased by 15% =
38. 38.430 increased by 10% =
39. 39.360 decreased by 30% =
40. 40.565 decreased by 20% =

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