The ordinal form of 12 is "twelfth". This is somewhat easy to forget, since in dates, numbers are not spelled out, and numbers past 10 are frequently written as "12th", etc. in text.
Forty-first
Thirty-five.
The ordinal number of 43 is 43rd and the ordinal word is forty-third.
The ordinal number is 18th or eighteenth. The word form is eighteen.
26th is the ordinal number and twentysixth is the oridnal word
1700th - Ordinal Number One thousand seven hundredth - Ordinal Word
43rdForty-third
53rd fifty-third
Ninety-first or 91st
16th
Eighth and 8th
51stFifty-first