Constant Suffixes Used in Sino-Korean Ordinal Numerals
번(番),호(號),차(次), and 회(回)are always used with Sino-Korean or Arabic ordinal numerals. For example, 이호선(二號線) is Line Number Two in metropolitan subway system. 37번국도(37番國道) is Highway Number 37. They cannot be used interchangeably. 906호(號) is 'Apt #906' in mailing address. 906 without 호 is not used in spoken Korean to imply apartment number or office suite #. Special prefix 제(第) is usually used in combination with suffixes to designate a specific event in sequential things such as the Olympics.
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