팔십
palsip · TOPIK 1
eighty (80)
팔십 = 팔 (eight, 八) + 십 (ten, 十): eight tens = eighty
Sino-Korean numbers stack like multiplication: 팔 (pal, 8) times 십 (sip, 10). The same pattern gives 이십 (20), 삼십 (30), 구십 (90). The hanja 八十 matches Chinese bāshí and Japanese hachijū, so one pattern covers all three.