Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 37 · 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. 1.560 decreased by 35% =
2. 2.192 decreased by 75% =
3. 3.525 decreased by 12% =
4. 4.80 decreased by 35% =
5. 5.180 decreased by 30% =
6. 6.320 decreased by 30% =
7. 7.668 decreased by 50% =
8. 8.608 increased by 50% =
9. 9.205 decreased by 20% =
10. 10.370 increased by 20% =
11. 11.625 decreased by 12% =
12. 12.500 increased by 60% =
13. 13.510 decreased by 30% =
14. 14.168 decreased by 50% =
15. 15.52 decreased by 75% =
16. 16.160 increased by 5% =
17. 17.575 increased by 40% =
18. 18.250 decreased by 30% =
19. 19.260 decreased by 20% =
20. 20.85 increased by 40% =
21. 21.84 increased by 50% =
22. 22.660 increased by 30% =
23. 23.125 decreased by 8% =
24. 24.360 decreased by 35% =
25. 25.760 increased by 15% =
26. 26.730 decreased by 20% =
27. 27.725 increased by 12% =
28. 28.112 increased by 25% =
29. 29.125 increased by 8% =
30. 30.650 decreased by 50% =
31. 31.560 increased by 10% =
32. 32.650 decreased by 12% =
33. 33.150 increased by 10% =
34. 34.130 increased by 30% =
35. 35.680 increased by 25% =
36. 36.196 increased by 75% =
37. 37.100 increased by 12% =
38. 38.150 increased by 8% =
39. 39.704 decreased by 50% =
40. 40.90 decreased by 10% =

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