When you write dates, especially the order of something, getting the ending right can be tricky. Have you ever wondered about the correct way to write the ordinal forms of numbers when marking specific dates or positions? It comes up more often than you might think.
The correct form is 13th. In English, ordinal numbers (numbers showing order) have specific suffixes: -st, -nd, -rd, and -th. The suffix depends on the last digit of the number. For example, 1 becomes 1st (first), 2 becomes 2nd (second), and 3 becomes 3rd (third). However, numbers ending in 3 use -rd unless they are in the teens (like 13, 14, or 15), which always end with -th.
So, when you write the ordinal form of 13, you add -th to make it 13th. This rule helps keep number ordinals consistent and easy to read. For instance, saying “Today is my 13th birthday” is correct, while “13st birthday” would be incorrect.
The Basics of Ordinal Numbers
First, let’s clear up what an ordinal number is. These numbers tell the position of something in a list or sequence. The second cake in a line of cakes, the third runner to finish the race, or the first day of the month. Ordinal numbers are different from cardinal numbers, which count things, like four oranges or two cars.
Understanding ‘th,’ ‘st,’ ‘nd,’ ‘rd’
English has a simple way of turning a cardinal number into an ordinal one by adding two letters at the end. Most numbers get a “th” ending, like 4th, 15th, or 19th. Easy, right? But, of course, there are always exceptions in English!
Numbers ending in 1 get a “st,” such as 21st, except when they end in 11. Then, they follow the usual rules and get a “th,” like 11th. Numbers ending in 2 get an “nd,” like 22nd, unless they end in 12. These get a “th,” too, such as 12th. Lastly, numbers ending in 3 receive an “rd,” like 23rd, unless they end in 13. They also break the pattern and get a “th,” like 13th.
So, When Is It Correct?
Now, let’s tackle the specific question: Which is correct, 13th or 13st? Think about what I explained with the exceptions. Since 13 ends in 3, it might tempt some people to use “st.” But remember, 13 is an exception because it ends in 13, so the correct form is “13th.”
Examples in Everyday Life
- You might celebrate a 13th birthday or a 13th anniversary.
- In competitions, someone could finish in 13th place.
- When organizing files or items, you might label something as the 13th in a sequence.
Can you see that in all these examples, “13th” fits naturally?
Why Does This Mistake Happen?
Errors often happen because of similar sounds or patterns we’ve already learned. If you hear “first” (1st) and “third” (3rd), you might unconsciously think that “13st” follows the same rule. It’s a normal mistake, especially for people just learning English.
Getting It Right
How can you prevent this mix-up? A good trick is to memorize the “teen” exceptions – those numbers from 11 to 19. All these numbers take the “th” ending. Writing them out a few times can help cement the rule in your mind. You could also keep a list handy until you feel more confident.
Conclusion
The next time you’re writing an invitation, preparing a presentation, or marking a calendar, double-check your ordinal numbers. Keep practicing, and soon enough, deciding between “13th” and “13st” will be a breeze. Why not look around right now for any numbers you can practice with? What’s today’s date? Is your favorite book part of a series? Check its volume number!
English might seem tricky at times with all its rules and exceptions. But with a bit of practice and attention, you’ll be able to master these smaller details. What do you think, doesn’t that sound achievable?
The simple trick of learning through everyday usage and visual reminders can be a big help. Whether it’s writing dates in your diary or organizing bookshelves, every little practice counts.
