Hi, I'm a korean. I don't english. but I can help you.
Korean has three number system.
First, Hangle.
Second, Arabic numerals.
Last, Chinese character.
● Hangle(korean) == Arabic numerals. == Chinese character. (But it's different from what the Chinese say. )
하나 == 1 == 一 (일)
둘 == 2 == 二 (이)
셋 == 3 == 三 (삼)
넷 == 4 == 四 (사)
다섯 == 5 == 五 (오)
여섯 == 6 == 六 (육)
일곱 == 7 == 七 (칠)
여덟 == 8 == 八 (팔)
아홉 == 9 == 九 (구)
열 == 10 == 十 (십)
열하나 == 11 == 十一 (십일)
...
스물 == 20 == 二十 (이십)
서른 == 30 == 三十 (삼십)
마흔 == 40 == 四十(사십)
쉰 == 50 == 五十 (오십)
예순 == 60 == 六十 (육십)
일흔 == 70 == 七十 (칠십)
여든 == 80 == 八十 (팔십)
아흔 == 90 == 九十(구십)
온 ( Not use ) == 100 == 百 (백)
It is better to read in Korean except when reading numbers.
● Reading
age - in Korean, calender, Arabic numerals - in Chinese character.
● Writing
everything - Arabic numerals.
※ Chinese characters are written on the grave.
Korean women who are not interested in Chinese characters will not know this. The reason lies in our culture. Wives and daughters often show tears when they write the names of their dead husbands or fathers in Chinese characters. So in the past, fathers did not teach their daughters Chinese characters.
● So !
1 - reading : 일 or 하나
2 - reading : 이 or 둘
one year of age : 한 살 ( False : 하나 살 )
two year of age : 두 살 ( False : 둘 살 )
three year of age : 세 살 ( False : 셋 살)
four year of age : 네 살 ( False : 네 살)
five year of age : 다섯 살.
ten year of age : 열 살.
eleven year of age : 열한 살.
January - 일 월 ( 月 - reading : 달(moon), 월(wul)
February - 이 월 ( False : 둘 월, 두 월 )
March - 삼 월 ( False : 셋 월, 세 월 )
April - 사 월 ( False : 넷 월, 네 월, 넉 월 )
The writing is long, but It is cheet key of the korean.
let's go bro.