The most common Korean word for “thirty” is 삼십 (samsip). There is one more word with a similar meaning — compare them below. 「thirty」는 한국어로 삼십.
thirty; 30
TOPIK 1 · number
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato
치즈감자