The functions of cardinal numerals in a sentence.

 Cardinal numerals are used in the function of subject, predi­cative, object, adverbial modifier and attribute (apposition).

... the young man opposite had long since disappeared. Now the othertwo got out. (Mansfield) (subject)

 Earle Fox was onlyfifty-four, bill he felt timeless and an­cient. (Wilson) (PREDICATIVE)

And again she saw them, but not four, more like forty laugh­ing, sneering, jeering... (Mansfield) (object)

      At eight the gang sounded for supper. (Mansfield) (adverbial modifier)

Four men in their shirtsleeves stood grouped together on the garden path. (Mansfield) (attribute)

And he remembered the holidays they used to have thefour of them, with a little girl, Rose, to look after the babies. (Mans­field) (apposition)

     Cardinals are sometimes used to denote the place of an object in a series. Cardinals are used in reading indications: line 23, page 275, Chapter X, No. 49 etc.

... but from the corner of the street until she came toNo. 26she thought of those four flights of stairs. (Mansfield)

Class nouns modified by a numeral in post-position are used without articles.

All he wanted was to be made to care again, but each night he took up his briefcase and walked home to dinner at 117th Street and Riverside Drive, apartment 12D. (Wilson)

Ordinal numerals.

Ordinal numerals show the order of persons and things in a series.

With the exception of the first three (first, second, third) the ordinal numerals are formed from cardinal numerals by means of the suffix –th.

In ordinal groups only the last member of the group takes the ordinal form: (the) sixty-fifth, (the) twenty-third. Ordinal numer­als are generally used with the definite article (the first, the fifth, the tenth etc.). Ordinal numerals may be used with the in­definite article when they do not show a definite order of per­sons and things in a series:

"I've torn simply miles and miles of the frill," waileda third.(Mansfield)