例如，为了获得小数，将分子乘以25，将分母乘以25，将3/4扩展为75/100：
| 3 | = | 3×25 | = | 75 | ×100％= | 75％ |
| 4 | 4×25 | 100 |
另一种方法是进行3除以4的长除法。
| 分数 | 百分 |
|---|---|
| 1/2 | 50％ |
| 1/3 | 33.33％ |
| 2/3 | 66.67％ |
| 1/4 | 25％ |
| 2/4 | 50％ |
| 3/4 | 75％ |
| 1/5 | 20％ |
| 2/5 | 40％ |
| 3/5 | 60％ |
| 4/5 | 80％ |
| 1/6 | 16.67％ |
| 2/6 | 33.33％ |
| 3/6 | 50％ |
| 4/6 | 66.67％ |
| 5/6 | 83.33％ |
| 1/7 | 14.285714％ |
| 2/7 | 28.571429％ |
| 3/7 | 42.857143％ |
| 4/7 | 57.142858％ |
| 5/7 | 71.428571％ |
| 6/7 | 85.714286％ |
| 1/8 | 12.5％ |
| 2/8 | 25％ |
| 3/8 | 37.5％ |
| 4/8 | 50％ |
| 5/8 | 62.5％ |
| 6/8 | 75％ |
| 7/8 | 87.5％ |
| 1/9 | 11.111111％ |
| 2/9 | 22.222222％ |
| 3/9 | 33.333333％ |
| 4/9 | 44.444444％ |
| 5/9 | 55.555556％ |
| 6/9 | 66.666667％ |
| 7/9 | 77.777778％ |
| 8/9 | 88.888889％ |
| 1/10 | 10％ |
| 2/10 | 20％ |
| 3/10 | 30％ |
| 4/10 | 40％ |
| 5/10 | 50％ |
| 6/10 | 60％ |
| 7/10 | 70％ |
| 8/10 | 80％ |
| 9/10 | 90％ |