one first 1st
two second 2nd
three third 3rd
four fourth 4th
five fifth 5th
six sixth 6th
seven seventh 7th
eight eighth 8th
nine ninth 9th
ten tenth 10th
註意:11、12與其他1、2結尾的序數詞縮寫不同
eleven eleventh 11th
twelve twelfth 12th
其他的都可參照1st、2nd、3rd
如21st、23rd等等