Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 906 · 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. 1.570 increased by 10% =
2. 2.620 decreased by 10% =
3. 3.560 increased by 10% =
4. 4.460 decreased by 15% =
5. 5.300 decreased by 8% =
6. 6.475 increased by 8% =
7. 7.500 decreased by 10% =
8. 8.390 increased by 40% =
9. 9.140 decreased by 35% =
10. 10.200 decreased by 35% =
11. 11.220 decreased by 35% =
12. 12.114 decreased by 50% =
13. 13.770 decreased by 10% =
14. 14.760 decreased by 20% =
15. 15.260 decreased by 30% =
16. 16.235 increased by 60% =
17. 17.750 decreased by 12% =
18. 18.604 decreased by 25% =
19. 19.470 increased by 10% =
20. 20.85 increased by 20% =
21. 21.320 increased by 15% =
22. 22.480 decreased by 15% =
23. 23.160 decreased by 10% =
24. 24.200 increased by 5% =
25. 25.790 decreased by 30% =
26. 26.172 increased by 25% =
27. 27.750 decreased by 10% =
28. 28.225 increased by 12% =
29. 29.600 increased by 75% =
30. 30.150 increased by 8% =
31. 31.390 decreased by 20% =
32. 32.570 decreased by 30% =
33. 33.500 decreased by 35% =
34. 34.100 increased by 12% =
35. 35.150 increased by 12% =
36. 36.710 decreased by 60% =
37. 37.710 increased by 20% =
38. 38.120 increased by 60% =
39. 39.800 decreased by 15% =
40. 40.580 decreased by 15% =

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