Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 325 · 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. 1.402 increased by 50% =
2. 2.674 increased by 50% =
3. 3.280 increased by 20% =
4. 4.120 increased by 30% =
5. 5.784 increased by 25% =
6. 6.570 decreased by 60% =
7. 7.120 increased by 15% =
8. 8.475 increased by 20% =
9. 9.710 increased by 60% =
10. 10.466 increased by 50% =
11. 11.340 increased by 5% =
12. 12.624 increased by 50% =
13. 13.730 decreased by 30% =
14. 14.700 increased by 12% =
15. 15.146 increased by 50% =
16. 16.40 increased by 40% =
17. 17.485 increased by 20% =
18. 18.660 decreased by 25% =
19. 19.780 decreased by 60% =
20. 20.40 increased by 15% =
21. 21.140 decreased by 15% =
22. 22.460 decreased by 15% =
23. 23.200 increased by 35% =
24. 24.700 increased by 40% =
25. 25.772 increased by 75% =
26. 26.460 decreased by 30% =
27. 27.560 increased by 35% =
28. 28.60 increased by 5% =
29. 29.260 decreased by 30% =
30. 30.140 increased by 10% =
31. 31.360 decreased by 35% =
32. 32.220 increased by 15% =
33. 33.75 increased by 12% =
34. 34.705 increased by 20% =
35. 35.340 increased by 35% =
36. 36.240 increased by 5% =
37. 37.150 increased by 12% =
38. 38.540 increased by 75% =
39. 39.180 increased by 30% =
40. 40.775 decreased by 8% =

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