Ordinal Numbers in English (Basic, A-Level)
In this lesson, you will learn the ordinal numbers in English.
Ordinal numbers are the numbers you use to order people and things: first, second, third, fourth, and so forth.
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Prerequisite: To understand this lesson, you need to know the cardinal numbers in English.
What Are Ordinal Numbers?
Ordinal numbers give you the position or place among people or things.
For example, in a marathon, let’s say that people arrive in this order: Jack, Maria, Pedro, Edward, and Albert.
Jack arrives first, so he is the winner.
Maria is in second place.
Pedro is the third runner to arrive.
Edward is in fourth place.
Albert is the fourth to arrive.
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Some changes in ordinal numbers
Some cardinal change when they become ordinal numbers:
one > first (1st)
two > second (2nd)
three > third (3rd)
five > fifth (5th)
eight > eighth (8th) (only one T)
nine > ninth (9th) (no E)
twelve > twelfth (12th) (V becomes F)
For all the 10s (ending in -ty), the Y changes to IE:
twenty > twentieth (20th)
thirty > thirtieth (30th)
forty > fortieth (40th)
and so on…
Pronunciation changes
five /ˈfaɪv/ > fifth /ˈfɪθ/ or /ˈfɪfθ/
All 10s ending in -ty
twenty /ˈtwɛnti/ > twentieth /ˈtwɛntijəθ/
thirty /ˈθɚti/ > thirtieth /ˈθɚtijəθ/
and so on…
The -th pattern
For all other numbers, add -th to the cardinal number to make it an ordinal number. There are some spelling and pronunciation changes you should notice:
- “Eight” becomes “eighth" (only one T).
- “Nine” becomes “ninth” (drop the E).
- ”Twelve” becomes “twelfth” (VE changes to F). The pronunciation also changes from /v/ to /f/.
- In numbers ending in “-ty,” the Y changes to IE such as twentieth, thirtieth, fortieth, and so forth. The pronunciation also changes to /-tiəθ/ (e.g., 20th /ˈtwentiəθ/, 30th /ˈθɚtijəθ/, 40th /ˈfɔːrtiəθ/).
Examples
four > four
six > six
seven >
eight > eighth
nine > nineth
ten > tenth
eleven > eleventh
twelve > twelfth
fifteen > fifteenth
sixteen > sixteenth
Always look at the Last Number
Notice that only the last number changes to its ordinal form.
112 > one hundred twelfth
601 > six hundred first
1,432 > one thousand four hundred thirty second.
1,000,000 > one millionth
1,007,024 > one million seven thousand twenty-fourth
Abbreviations
To abbreviate ordinals, add the last two letters of the ordinal number.
first - 1st
second - 2nd
third - 3rd
fourth - 4th
fifth - 5th
and so on…
Be Careful
Be careful to add the correct abbreviation based on the last number.
101st (one hundred first)
102nd (one hundred second)
1,003rd (one thousand third)
1,004th (one thousand fourth)
1,000,000th (one millionth)
1,000,001st (one million first)
Don’t make this mistake!
Most ordinal numbers end in TH, so it is a common mistake to add a TH to any number. You end up with, for example, 31th, which is wrong!
Remember, you must look at the last number. “Thirty-one” becomes “thirty-first, so the abbreviation is 31st.
Practice
Practice 1. Practice writing ordinal numbers in sentences.
Practice 2. Practice writing ordinal numbers in sentences.
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