Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 797 · 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. 1.550 decreased by 12% =
2. 2.660 decreased by 20% =
3. 3.620 decreased by 75% =
4. 4.200 increased by 8% =
5. 5.90 decreased by 40% =
6. 6.145 increased by 60% =
7. 7.315 decreased by 20% =
8. 8.390 increased by 20% =
9. 9.720 decreased by 5% =
10. 10.70 increased by 40% =
11. 11.730 increased by 60% =
12. 12.420 decreased by 5% =
13. 13.730 decreased by 10% =
14. 14.100 increased by 12% =
15. 15.290 increased by 30% =
16. 16.500 increased by 5% =
17. 17.105 decreased by 60% =
18. 18.400 decreased by 8% =
19. 19.148 decreased by 50% =
20. 20.188 decreased by 75% =
21. 21.70 decreased by 10% =
22. 22.730 increased by 20% =
23. 23.525 increased by 8% =
24. 24.440 increased by 10% =
25. 25.190 decreased by 10% =
26. 26.304 increased by 75% =
27. 27.160 increased by 25% =
28. 28.415 increased by 60% =
29. 29.220 increased by 15% =
30. 30.640 increased by 35% =
31. 31.372 decreased by 25% =
32. 32.310 increased by 10% =
33. 33.65 decreased by 60% =
34. 34.490 increased by 40% =
35. 35.320 decreased by 15% =
36. 36.275 decreased by 8% =
37. 37.245 decreased by 20% =
38. 38.760 increased by 30% =
39. 39.325 decreased by 12% =
40. 40.165 increased by 40% =

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