Ordinal Numbers in English

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Ordinal Numbers

Numeral adjectives (first, second, etc.) are used to list elements in a sequence:
1st first
2nd second
3rd third
4th fourth
5th fifth
6th sixth
7th seventh
8th eighth
9th ninth
10th tenth
11th eleventh
12th twelfth
13th thirteenth
14th fourteenth
15th fifteenth
16th sixteenth
17th seventeenth
18th eighteenth
19th nineteenth
20th twentieth
31st thirty-first
100th one hundredth
511th five hundred and eleventh
Note: In the written versions, we add st, nd or th to the number.
first → 1st
second → 2nd
tenth → 10th
Fun with Ordinal Numbers!
We use numeral adjectives to express dates. Example:
10th April, 2008 the tenth of April, two thousand and eight (UK)
or April (the) tenth, two thousand and eight
April 10, 2008 April ten(th), two thousand eight (US)
We also express centuries and titles (of Kings, Queens, Popes, etc.) with numeral adjectives:
Charles I (1600-1649)
You: Did you know that Charles the First lived in the seventeenth century?
Friend: Really? You're so clever! The 21st century is a lot more interesting with you in it.

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