‘3rd’ or ‘3th’: Which is Correct?
Are you curious whether ‘3rd’ or ‘3th’ is correct? Read this guide with examples, definitions, and grammar tips to learn the answer.

Ordinal Numbers in English – Rules, List, Usage & Examples
Ordinal numbers in English show the position or order of things—like first, second, third, and so on. They’re used all the time in everyday English, whether you’re talking about dates, competitions, floors in a building, or steps in a process.

orthography - What do we call the “rd” in “3ʳᵈ” and the “th ...
Just a small remark: According to the English typography, the ordinal indicators are not written in superscript. In French or Spanish you do that, not in English. It's only Microsoft Word that implemented the feature years ago and since then, people think it's correct. It's a suffix.

Third - Wikipedia
Look up third, 3rd, or ⅓ in Wiktionary, the free dictionary.

Ordinal numeral - Wikipedia
Ordinal numbers may be written in English with numerals and letter suffixes: 1st, 2nd or 2d, 3rd or 3d, 4th, 11th, 21st, 101st, 477th, etc., with the suffix acting as an ordinal indicator.

3th or 3rd? - Spelling Which Is Correct How To Spell
Correct spelling, explanation: 3rd is the correct form because the full-written form is third. In ordinal numbers, the last two letters are the abbreviation added to a number form, for example first = 1st, fifteenth = 15th.

3rd or 3th – Which is Correct? - Two Minute English
The use of “3rd” comes from an old tradition of English spelling, where the “ir” in the middle of “third” hints at its position. “3th” could confuse readers and listeners, as it sounds like an error.

Cardinal and Ordinal Numbers Chart - Math is Fun
A Cardinal Number is a number that says how many of something there are, such as one, two, three, four, five. An Ordinal Number is a number that tells the position of something in a list, such as 1st, 2nd, 3rd, 4th, 5th and so on. Most ordinal numbers end in "th" except when the final word is: Watch out for spelling changes!

how to spell ordinal numbers — How to Spell
3rd = third (Take the third turning on the left.) 4th = fourth (It's his fourth birthday.) 5th = fifth (This is the 5th time I've taken my driving test.) We need to write these ordinal numbers in words in formal writing - business, job applications, etc.

THIRD | English meaning - Cambridge Dictionary
THIRD definition: 1. 3rd written as a word: 2. one of three equal parts of something: 3. an undergraduate degree…. Learn more.