칠십
chilsip · TOPIK 1
seventy (70)
칠십 = 칠 (seven) + 십 (ten): seven tens = seventy
Sino-Korean numbers stack like multiplication: 칠 (七, seven) times 십 (十, ten). Same pattern as 이십 (20) and 삼십 (30). The native Korean word for seventy is 일흔, used for ages and counting; 칠십 is for dates, money and minutes.