Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 540 · 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. 1.370 increased by 10% =
2. 2.570 decreased by 50% =
3. 3.660 decreased by 15% =
4. 4.115 increased by 20% =
5. 5.84 decreased by 75% =
6. 6.400 decreased by 30% =
7. 7.568 increased by 50% =
8. 8.800 increased by 15% =
9. 9.530 decreased by 30% =
10. 10.660 increased by 25% =
11. 11.620 increased by 75% =
12. 12.60 decreased by 20% =
13. 13.490 increased by 20% =
14. 14.670 decreased by 10% =
15. 15.212 increased by 25% =
16. 16.220 decreased by 30% =
17. 17.580 decreased by 15% =
18. 18.750 decreased by 8% =
19. 19.670 increased by 10% =
20. 20.480 increased by 5% =
21. 21.40 increased by 30% =
22. 22.90 decreased by 60% =
23. 23.360 increased by 5% =
24. 24.300 increased by 15% =
25. 25.480 increased by 35% =
26. 26.284 increased by 75% =
27. 27.700 increased by 5% =
28. 28.250 increased by 20% =
29. 29.770 increased by 10% =
30. 30.120 increased by 35% =
31. 31.180 decreased by 5% =
32. 32.725 decreased by 40% =
33. 33.785 increased by 20% =
34. 34.260 decreased by 25% =
35. 35.704 increased by 75% =
36. 36.376 decreased by 25% =
37. 37.630 decreased by 30% =
38. 38.230 decreased by 10% =
39. 39.765 decreased by 20% =
40. 40.205 decreased by 40% =

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