List of Cardinal and Ordinal Numbers
English Numerals - things to remember
Cardinal numbers refer to the size of a group.
I am twenty years old. I have four friends.
Ordinal numbers refer to a position in a series.
My first friend is a student. Today is his nineteenth birthday.
- Any ordinal name that doesn't end in st, nd, rd (as in "first", "second", or "third"), ends in th.
- All compound numbers from twenty-one through ninety-nine should be separated by a hyphen (twenty-two, seventy-first).
- A comma is optional with four-digit numbers but required with five-digit numbers (3000 30,000)