13th or 13rd: Which is Correct?
When it comes to writing ordinal numbers, many of us may have wondered whether to use "13th" or "13rd". Both options seem correct, but only one is grammatically correct. In this article, we'll explore the rules and exceptions to determine which one is the correct usage.
The General Rule
In English, ordinal numbers are formed by adding -st, -nd, -rd, or -th to the cardinal number. The general rule is as follows:
- -st is added to numbers ending in 1 (except for 11th)
- -nd is added to numbers ending in 2 (except for 12th)
- -rd is added to numbers ending in 3 (except for 13th)
- -th is added to all other numbers
The Exception: 13th
According to the general rule, numbers ending in 3 should add -rd. However, there is an exception to this rule. When the number ends in 13, we use -th instead of -rd. Therefore, the correct usage is 13th, not 13rd.
Why is 13th Correct?
The reason behind this exception is due to the historical influence of Old English and Middle English on modern English. In Old English, the ordinal number for 13 was "þrittēoþa", which was later adapted to "thirteenth" in Middle English. This form has been retained in modern English, resulting in the correct usage being 13th.
Conclusion
In conclusion, when writing ordinal numbers, remember that 13th is the correct usage, not 13rd. While it may seem counterintuitive, the exception to the general rule is rooted in the historical development of the English language. By following this rule, you'll ensure that your writing is grammatically correct and free of errors.
Remember, when in doubt, always consult a reliable grammar resource or style guide to confirm the correct usage of ordinal numbers.
