The most common Korean word for “fifty” is 오십 (osip). There is one more word with a similar meaning — compare them below. 「fifty」는 한국어로 오십.
Learn 오십 free — flashcards, audio and review →「오십」 단어장으로 무료로 외우기Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato