What's the ordinal number of one？
first
What's the ordinal number of two?
second
What's the ordinal number of three?
third
What's the ordinal number of four?
fourth
What's the ordinal number of five?
fifth
What's the ordinal number of six?
sixth
What's the ordinal number of nine?
ninth
What's the ordinal number of ten?
tenth
What's the ordinal number of eleven?
eleventh
What's the ordinal number of twelve?
twelfth
What's the ordinal number of thirteen?
thirteenth
What's the ordinal number of fourthen?
fourteenth
What's the ordinal number of seventeen?
seventeenth
What's the ordinal number of eighteen?
eighteenth
What's the ordinal number of nineteen?
nineteenth
What's the ordinal number of twenty?
twentieth
