Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 989 · 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. 1.575 increased by 8% =
2. 2.720 increased by 15% =
3. 3.450 increased by 12% =
4. 4.790 increased by 40% =
5. 5.50 decreased by 12% =
6. 6.576 increased by 50% =
7. 7.130 decreased by 10% =
8. 8.690 increased by 60% =
9. 9.40 increased by 15% =
10. 10.520 decreased by 5% =
11. 11.140 increased by 15% =
12. 12.280 decreased by 35% =
13. 13.392 decreased by 75% =
14. 14.800 increased by 35% =
15. 15.205 increased by 60% =
16. 16.156 increased by 75% =
17. 17.140 increased by 15% =
18. 18.380 increased by 25% =
19. 19.800 increased by 15% =
20. 20.400 decreased by 5% =
21. 21.260 increased by 20% =
22. 22.485 decreased by 60% =
23. 23.275 increased by 20% =
24. 24.108 increased by 75% =
25. 25.420 decreased by 15% =
26. 26.125 increased by 8% =
27. 27.575 increased by 12% =
28. 28.800 increased by 15% =
29. 29.560 decreased by 15% =
30. 30.100 increased by 5% =
31. 31.175 decreased by 12% =
32. 32.510 increased by 40% =
33. 33.170 decreased by 10% =
34. 34.175 increased by 12% =
35. 35.575 decreased by 40% =
36. 36.745 increased by 20% =
37. 37.510 decreased by 30% =
38. 38.195 decreased by 40% =
39. 39.692 increased by 50% =
40. 40.130 decreased by 60% =

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