1. Ordinal numbers can be done by adding th in the end number except that ends with the 1 (st), 2 (nd), and 3 (RD)
2. Number ends. Ty when change is ordinal numbers to change ty as tie then add th for instance
.Twenty is the twentieth (2 0)
thirty is the thirtieth (30)
3. Number ending with ve to change VE is F first, then fill. Th for example
then add th for example,
five is fifth
twelve is twelfth
.