在英语中，数字分为基数词和序数词。基数词用于表示数量，而序数词用于表示顺序。以下是1到100的常见基数词与对应的序数词总结：
| 基数词 | 序数词 | 基数词 | 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 |
| ... | ... | ... | ... |
多数序数词在基数词后加“-th”，但需注意特殊变化，如“first”、“second”、“third”等。掌握这些规则有助于正确使用数字表达。
