1 = first
2 = second
3 = third
4 = fourth
5 = fifth
6 = sixth
7 = seventh
8 = eighth
9 = ninth
10 = tenth
11 = eleventh
12 = twelfth
13 = thirteenth
14 = fourteenth
15 = fifteenth
16 = sixteenth
17 = seventeenth
18 = eighteenth
19 = nineteenth
20 = twentieth
21 = twenty-first
22 = twenty-second
23 = twenty-third
24 = twenty-fourth
25 = twenty-fifth
26 = twenty-sixth
27 = twenty-seventh
28 = twenty-eighth
29 = twenty-ninth
30 = thirtieth
31 = thirty-first
40= fortieth
50 = fiftieth
60 = sixtieth
70 = seventieth
80 = eightieth
90 = ninetieth
100 = hundredth