How Do You Write The Ordinal Number In Word Form?

First, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, sixteenth, seventh, eighteenth, nineteenth, twentieth

twenty-first, twenty-fifth, thirty-second, fifty-eighth, sixty-fourth, seventy-ninth, eighty-third, ninety-ninth

After that it's usually digits and letters, ie, 2nd, 7th, 20th, 23rd, 52nd, 135th, 301st

Any ordinal name that doesn't end in "first," "second," or "third," ends in "th."