Pure Korean Numbers

The table below shows the “pure Korean” numbers. They are used mostly for counting.

1 하나
2 둘
3 셋
4 넷
5 다섯
6 여섯
7 일곱
8 여덟
9 아홉
10 열
20 스물
30 서른
40 마흔
50 쉰
60 예순
70 일흔
80 여든
90 아흔

To put together numbers like "17" or "35" you just write the tens number followed by the ones number. Thus,
17 = 열일곱
35 = 서른다섯

Note: when they precede a “classifier” (such as the word for “o’clock” when telling time), numbers ending in digits 1-4 and the number 20 change as follows:

하나 becomes 한
둘 becomes 두
셋 becomes 세
넷 becomes 네 , and
스물 becomes 스무

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