Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 645 · 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. 1.390 increased by 20% =
2. 2.620 decreased by 15% =
3. 3.570 increased by 10% =
4. 4.540 decreased by 15% =
5. 5.100 decreased by 10% =
6. 6.475 decreased by 40% =
7. 7.220 increased by 30% =
8. 8.680 increased by 5% =
9. 9.180 decreased by 5% =
10. 10.620 increased by 10% =
11. 11.66 decreased by 50% =
12. 12.260 increased by 5% =
13. 13.64 increased by 25% =
14. 14.720 increased by 30% =
15. 15.620 decreased by 35% =
16. 16.712 decreased by 25% =
17. 17.790 decreased by 10% =
18. 18.360 increased by 35% =
19. 19.680 decreased by 5% =
20. 20.688 increased by 75% =
21. 21.620 decreased by 5% =
22. 22.290 decreased by 30% =
23. 23.460 decreased by 5% =
24. 24.725 increased by 12% =
25. 25.775 increased by 12% =
26. 26.485 decreased by 20% =
27. 27.460 decreased by 40% =
28. 28.44 decreased by 25% =
29. 29.502 increased by 50% =
30. 30.460 decreased by 30% =
31. 31.690 increased by 30% =
32. 32.490 decreased by 10% =
33. 33.275 decreased by 8% =
34. 34.755 decreased by 40% =
35. 35.280 increased by 5% =
36. 36.80 increased by 10% =
37. 37.300 decreased by 15% =
38. 38.250 increased by 30% =
39. 39.620 decreased by 10% =
40. 40.530 increased by 40% =

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