How To Use Ordinal number In A Sentence

Know how to distinguish and use ordinal numbers and cardinal numbers.
Ordinal numbers are used in these sentences: 'She was fifth in the race' and 'They celebrated the 200th anniversary of the university's foundation'.
in the middle ages feria was used with a prefixed ordinal number to designate the day of the week, so `secunda feria' meant Monday, but Sunday and Saturday were always called by their names, Dominicus and Sabbatum, and so feria came to mean an ordinary weekday
ordinal numbers
In 1905 Bernstein published an important article on transfinite ordinal numbers.

His work on ordered sets and ordinal numbers is fundamental to the subject.
In the course of development of Cantor's theory of cardinal and ordinal numbers a question was raised whether every set can be provided with a certain structure, called well-ordering of the set. Set Theory
The hierarchy of logical systems that one obtains by the procedure that I have described above is characterized by computable ordinal numbers.
Ordinal numbers are used in these sentences: 'She was fifth in the race' and 'They celebrated the 200th anniversary of the university's foundation'.
The hierarchy of logical systems that one obtains by the procedure that I have described above is characterized by computable ordinal numbers.
The elements of a model are irrelevant; it is easiest just to take them to be pure sets, or ordinal numbers, or some other type of familiar mathematical object.