In Korea, there are two sets of numbers, first, is native Korean numbers and the second one is the Sino-Korean numbers, which are used more in general.
Native Korean numbers are used for telling time ONLY for hours, amount of hours, amount of months and numbers for age.
Sino-Korean numbers are used for telling time ONLY for minutes and seconds, dates and months of the year, amount of money /currency, maths, measurements, phone numbers, addresses, floor of building and everything else.
If you are unsure which set to use, use Sino-Korean as most Koreans will understand what you mean.
Zero-gong [공]
One-hana [하나]
Two-dul [돌]
Three-set [셋]
Four-net [넷]
Five-daseot [다섯]
Six-yeoseot [여섯]
Seven-ilgop [일곱]
Eight-yeodeol [여덟]
Nine-ahop [아흡]
Ten-yeol [열]
Eleven-yeol-hana [열하나]
Twelve-yeol-dul [열둘]
Thirteen-yeol-set [ 열셋]
Fourteen-yeol-net [열넷]
Fifteen-yeol-daseot [열다섯]
Sixteen-yeol-yeoseot [열여섯]
Seventeen-yeol-ilgop [열일곱]
Eighteen-yeol-yeodeol [열여덟]
Nineteen-yeol-ahop [열아흡]
Twenty-seumul [스물]
Thirty-seoleum [서른]
Forty-maheun [마흔]
Fifty-swin [쉰]
Sixty-yesun [예순]
Seventy-ilheun [일흔]
Eighty-yeoduen [여든]
Ninety-ahuen [아흔]
Hundred-on [온]
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