first (1st) second (2nd) third (3rd) fourth (4th) fifth (5th)
sixth (6th) seventh (7th) eighth (8th) ninth (9th) tenth (10th) eleventh (11th) twelfth(12th) thirteenth (13th) fourteen (14th) fifteenth (15th) sixteenth (16th) seventeen (17th) eighteenth (18th) nineteenth (19th) twentieth (20th)
twenty-first 第21
twenty-second 第22
twenty-third 第23
twenty-fourth(第24)
twenty-fifth(第25)
twenty-sixth (第26)
twenty-seventh(第27)
twenty-eighth (第28)
twenty-ninth (第29)
thirtieth (第30)