Ordinal numbers

1st: first
2nd: second
3rd: third
4th: fourth
5th: fifth
6th: sixth
7th: seventh
8th: eighth
9th: ninth
10th: tenth
11th: eleventh
12th: twelfth
13th: thirteenth
14th: fuorteenth
15th: fifteenth
16th: sixteenth
17th: seventeenth
18th: eighteenth
19th: nineteenth
20th: twentieth
21st: twenty-first
22nd: twenty-second
30th: thirtieth
40th: fortieth
50th: fiftieth