Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 131 · 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. 1.475 decreased by 12% =
2. 2.800 increased by 60% =
3. 3.415 increased by 40% =
4. 4.490 increased by 10% =
5. 5.396 increased by 50% =
6. 6.540 increased by 35% =
7. 7.660 increased by 5% =
8. 8.80 decreased by 35% =
9. 9.455 increased by 20% =
10. 10.520 decreased by 15% =
11. 11.668 decreased by 75% =
12. 12.360 increased by 30% =
13. 13.280 decreased by 35% =
14. 14.640 decreased by 35% =
15. 15.550 decreased by 8% =
16. 16.660 decreased by 35% =
17. 17.480 decreased by 35% =
18. 18.70 decreased by 60% =
19. 19.720 decreased by 5% =
20. 20.80 increased by 5% =
21. 21.240 decreased by 35% =
22. 22.282 decreased by 50% =
23. 23.140 increased by 35% =
24. 24.690 decreased by 60% =
25. 25.675 increased by 8% =
26. 26.800 decreased by 10% =
27. 27.770 decreased by 10% =
28. 28.400 increased by 15% =
29. 29.170 increased by 10% =
30. 30.110 decreased by 40% =
31. 31.735 increased by 20% =
32. 32.40 increased by 5% =
33. 33.230 increased by 20% =
34. 34.350 increased by 8% =
35. 35.200 increased by 15% =
36. 36.380 decreased by 35% =
37. 37.590 increased by 10% =
38. 38.60 decreased by 30% =
39. 39.200 increased by 8% =
40. 40.40 increased by 15% =

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