Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 412 · 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. 1.590 decreased by 60% =
2. 2.300 decreased by 8% =
3. 3.140 increased by 40% =
4. 4.470 decreased by 10% =
5. 5.600 decreased by 10% =
6. 6.60 increased by 40% =
7. 7.750 increased by 8% =
8. 8.615 decreased by 20% =
9. 9.580 increased by 30% =
10. 10.60 increased by 35% =
11. 11.420 increased by 40% =
12. 12.490 decreased by 30% =
13. 13.260 decreased by 35% =
14. 14.680 increased by 35% =
15. 15.100 increased by 60% =
16. 16.140 increased by 30% =
17. 17.120 increased by 35% =
18. 18.150 decreased by 12% =
19. 19.625 decreased by 12% =
20. 20.740 decreased by 15% =
21. 21.745 increased by 20% =
22. 22.650 decreased by 30% =
23. 23.425 increased by 8% =
24. 24.288 decreased by 75% =
25. 25.60 increased by 30% =
26. 26.295 increased by 20% =
27. 27.400 decreased by 15% =
28. 28.400 increased by 12% =
29. 29.556 increased by 50% =
30. 30.470 decreased by 40% =
31. 31.575 decreased by 8% =
32. 32.352 increased by 50% =
33. 33.88 decreased by 75% =
34. 34.200 decreased by 60% =
35. 35.625 decreased by 20% =
36. 36.400 decreased by 15% =
37. 37.220 increased by 10% =
38. 38.565 decreased by 40% =
39. 39.550 decreased by 12% =
40. 40.280 decreased by 5% =

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