Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 632 · 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. 1.495 decreased by 40% =
2. 2.196 decreased by 50% =
3. 3.340 decreased by 35% =
4. 4.604 increased by 50% =
5. 5.610 increased by 60% =
6. 6.150 decreased by 10% =
7. 7.280 increased by 15% =
8. 8.480 decreased by 35% =
9. 9.780 increased by 10% =
10. 10.240 increased by 10% =
11. 11.40 decreased by 20% =
12. 12.140 increased by 60% =
13. 13.160 decreased by 75% =
14. 14.420 decreased by 75% =
15. 15.250 decreased by 10% =
16. 16.750 increased by 30% =
17. 17.730 decreased by 30% =
18. 18.324 increased by 75% =
19. 19.800 decreased by 50% =
20. 20.500 decreased by 35% =
21. 21.780 increased by 75% =
22. 22.405 increased by 40% =
23. 23.790 increased by 60% =
24. 24.735 decreased by 40% =
25. 25.720 decreased by 35% =
26. 26.440 increased by 5% =
27. 27.380 increased by 25% =
28. 28.675 decreased by 12% =
29. 29.175 increased by 12% =
30. 30.200 increased by 12% =
31. 31.340 increased by 30% =
32. 32.175 increased by 60% =
33. 33.390 increased by 30% =
34. 34.160 increased by 10% =
35. 35.125 decreased by 20% =
36. 36.285 decreased by 20% =
37. 37.585 increased by 60% =
38. 38.164 decreased by 75% =
39. 39.225 decreased by 20% =
40. 40.100 increased by 35% =

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