学习英语时，掌握序数词是基础内容之一。以下是1到100的英语序数词总结，方便查阅和记忆。
| 序号 | 英语序数词 | 序号 | 英语序数词 |
| 1 | first | 51 | fifty-first |
| 2 | second | 52 | fifty-second |
| 3 | third | 53 | fifty-third |
| 4 | fourth | 54 | fifty-fourth |
| 5 | fifth | 55 | fifty-fifth |
| 6 | sixth | 56 | fifty-sixth |
| 7 | seventh | 57 | fifty-seventh |
| 8 | eighth | 58 | fifty-eighth |
| 9 | ninth | 59 | fifty-ninth |
| 10 | tenth | 60 | sixtieth |
| ... | ... | ... | ... |
| 90 | ninetieth | 100 | one hundredth |
大部分序数词在基数词后加“-th”，但有例外如first、second、third等。数字大于20时，通常将十位与个位用连字符连接，如twenty-first。掌握这些规则有助于正确使用英语序数词。
