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Korean has two number systems: 「native Korean numbers」 and 「Sino-Korean numbers」. Which one you use usually depends on the counter that follows, the size of the number, and the context. Native Korean numbers are generally used for people, cups, everyday ages, and ordinary clock times, while Sino-Korean numbers are generally used for dates, prices, minutes, floors, and numbers or codes. This is only a convenient rule of thumb, however. Some units may be read differently depending on the context or conventional usage.

Three people is 「세 명」, but the third floor is 「삼 층」. At 3:15, it becomes 「세 시 십오 분」, with both number systems appearing in the same expression. When you first encounter combinations like these, it is easy to stop and wonder whether the 3 in front of you should be read as 「세」 or 「삼」. Learning numbers together with units such as 「명、층、시、분」 is much closer to how they are actually used in everyday Korean than memorizing the two number systems separately.

Why Does Korean Have Two Ways to Read Numbers? Start with Counters and Context

Korean numbers can be confusing because the same Arabic numeral may have two different readings. 1 can be 「하나」 or 「일」, while 2 can be 「둘」 or 「이」. These forms are not interchangeable at random. They exist because Korean has long used both an indigenous number system and a number system derived from Chinese characters.

Native Korean numbers are generally used for people, cups, everyday ages, and ordinary clock times, while Sino-Korean numbers are generally used for dates, prices, minutes, floors, and numbers or codes. This classification is useful for building an initial understanding, but it is not an absolute rule. Some units change depending on the size of the number, the situation, or conventional usage, so in actual use you still need to look at the counter or unit that follows.

Korean Number Chart: Native Korean Numbers, Sino-Korean Numbers, and Pronunciation from 1 to 10

Number	Native Korean Number	Romanization	Sino-Korean Number	Romanization
1	하나	ha-na	일	il
2	둘	dul	이	i
3	셋	set	삼	sam
4	넷	net	사	sa
5	다섯	da-seot	오	o
6	여섯	yeo-seot	육	yuk
7	일곱	il-gop	칠	chil
8	여덟	yeo-deol	팔	pal
9	아홉	a-hop	구	gu
10	열	yeol	십	sip

When native Korean numbers come before certain counters, 하나 changes to 한, 둘 to 두, 셋 to 세, 넷 to 네, and 스물 to 스무. For example, “one item” is 「한 개」, while twenty years old is 「스무 살」. You cannot simply place the dictionary forms 「하나」 or 「스물」 directly before these counters. Numbers 11 through 14 are also expressed as 「열한、열두、열세、열네」, as in 「열한 명」 and 「열두 시」.

Usage ① of 「Native Korean Numbers」｜Age, Number of People, and Actual Quantities

Native Korean numbers most often appear next to “things you can count in everyday life,” such as how many items, people, cups, or years of age. They have a very everyday feel, as if you are literally counting people, cups, or portions of food in front of you. When they are used with counters, pay attention to the shortened forms, especially 「한、두、세、네」, which appear more often in everyday sentences than the original forms.

• Example: 손님 세 명이 기다리고 있어요.
  Romanization: son-nim se myeong-i gi-da-ri-go i-sseo-yo
  Translation: Three customers are waiting.
  「세 명」 uses a native Korean number because it counts an actual number of people. 「명」 is a counter for people.
• Example: 커피 두 잔 주세요.
  Romanization: keo-pi du jan ju-se-yo
  Translation: Two cups of coffee, please.
  When ordering drinks, you say 「두 잔」, not 「이 잔」. This is a typical example of a native Korean number used with a counter.
• Example: 동생은 스무 살이에요.
  Romanization: dong-saeng-eun seu-mu sa-ri-e-yo
  Translation: My younger sibling is twenty years old.
  Everyday age expressions usually use native Korean numbers with 「살」, so twenty years old is 「스무 살」. In formal materials, news reports, or announcements, Sino-Korean numbers are also often used with 「세」, so twenty years old may be written as 「이십 세」.

Usage ② of 「Sino-Korean Numbers」｜Dates, Prices, Floors, and Numbers

Sino-Korean numbers are used more like a system for reading standardized numerical information. Dates, prices, floors, minutes, and telephone numbers normally use Sino-Korean rather than native Korean numbers. These numbers are often not used to count visible objects, but to mark positions, times, amounts, or codes, so they use the 「일、이、삼、사」 system.

• Example: 회의는 삼월 십오 일에 있어요.
  Romanization: hoe-ui-neun sam-wol si-bo-i-re i-sseo-yo
  Translation: The meeting is on March 15.
  Months and dates use Sino-Korean numbers, so it is 「삼 월 십오 일」 rather than a native Korean number.
• Example: 이 책은 만 오천 원이에요.
  Romanization: i chae-geun man o-cheon wo-ni-e-yo
  Translation: This book costs 15,000 won.
  Prices are read with Sino-Korean numbers, and 「원」 for Korean won normally follows a Sino-Korean number.
• Example: 식당은 이 층에 있어요.
  Romanization: sik-dang-eun i cheung-e i-sseo-yo
  Translation: The restaurant is on the second floor.
  Floor numbers are location labels and commonly use Sino-Korean numbers, so the second floor is 「이 층」.

Usage ③ of 「Korean Time Expressions」｜Native Korean Numbers for 1–12 O’Clock, Sino-Korean Numbers for Minutes

Korean time expressions combine both number systems in the same sentence. In everyday use, hours from 1 to 12 generally use native Korean numbers, while minutes use Sino-Korean numbers, so 3:15 is 「세 시 십오 분」. In transportation timetables, business hours, and other 24-hour time formats, hours from 13 onward are often expressed with Sino-Korean numbers, such as 「십삼 시、이십 시」. This means that the number before 「시」 also depends on whether you are using ordinary clock time or a formal 24-hour format.

• Example: 수업은 아홉 시에 시작해요.
  Romanization: su-eo-beun a-hop si-e si-ja-kae-yo
  Translation: Class starts at nine o’clock.
  The number before 「시」 uses the native Korean system, so nine o’clock is 「아홉 시」.
• Example: 기차는 여섯 시 이십 분에 출발해요.
  Romanization: gi-cha-neun yeo-seot si i-sip bun-e chul-bal-hae-yo
  Translation: The train leaves at 6:20.
  「여섯 시」 uses a native Korean number, while 「이십 분」 uses a Sino-Korean number, so both systems appear together.
• Example: 지금은 열한 시 삼십 분이에요.
  Romanization: ji-geu-meun yeol-han si sam-sip bu-ni-e-yo
  Translation: It is 11:30 now.
  「열한 시」 combines a native Korean number with hours, while 「삼십 분」 combines a Sino-Korean number with minutes.

Korean 「Native Korean Numbers」 vs 「Sino-Korean Numbers」: Comparing Counters and Usage

Comparison	Native Korean Numbers	Sino-Korean Numbers
Core feeling	Counting actual quantities in front of you	Reading standardized or institutionalized numbers
Common combinations	개、명、잔、살、시、번（frequency）	월、일、분、원、층、번（number）
Common situations	Ordering, number of people, age, clock time	Dates, prices, minutes, telephone numbers, floors
Form changes	하나、둘、셋、넷、스물 change form	Usually read according to the number combination
Common mistakes	Forgetting 한、두、세、네	Using native Korean numbers for prices or dates

▌Use Native Korean Numbers before the Cup Counter 「잔」

❌ Unnatural: 커피 이 잔 주세요.

(Drink quantities in cups use native Korean numbers, not Sino-Korean numbers.)

✅ Correct: 커피 두 잔 주세요.

「잔」 is a counter, so it is preceded by the native Korean form 「두」.

▌Months and Dates Use Sino-Korean Numbers

❌ Unnatural: 오늘은 세 월 다섯 일이에요.

✅ Correct: 오늘은 삼 월 오 일이에요.

Months and dates use Sino-Korean numbers, so March 5 is 「삼 월 오 일」.

Useful Korean Numbers for Travel in Korea: Ordering, Floors, and Meeting Times

Korean numbers come up almost every day when traveling in Korea. You need to say how many cups you want when ordering coffee, check which floor you need in an elevator, understand what time and minute to meet, and listen for prices at checkout. The difficult part is often not the number itself, but failing to catch the counter or unit that follows it. When you hear 「잔、명、개、살、시」, you can usually start by thinking of native Korean numbers. When you hear 「원、층、분、월、일」, Sino-Korean numbers are generally used. 「번」 needs to be interpreted according to meaning: when it means frequency, use 「한 번、두 번」; when it refers to a number or code, use 「1번／일 번、2번／이 번」.

▌Situation ①｜Ordering Two Drinks at a Café in Korea

A：아메리카노 몇 잔 드릴까요?
　　a-me-ri-ka-no myeot jan deu-ril-kka-yo
　　How many Americanos would you like?

B：두 잔 주세요.
　　du jan ju-se-yo
　　Two, please.

📌 Grammar Point: 「잔」 is a counter, so it takes a native Korean number. 「두 잔」 is a very common expression when ordering drinks.

▌Situation ②｜Checking Which Floor the Restaurant Is On

A：식당은 어디에 있어요?
　　sik-dang-eun eo-di-e i-sseo-yo
　　Where is the restaurant?

B：삼 층에 있어요.
　　sam cheung-e i-sseo-yo
　　It is on the third floor.

📌 Grammar Point: 「층」 indicates floors and is generally preceded by a Sino-Korean number, so the third floor is 「삼 층」.

▌Situation ③｜Confirming What Time to Meet

A：몇 시에 만날까요?
　　myeot si-e man-nal-kka-yo
　　What time shall we meet?

B：네 시 십 분에 만나요.
　　ne si sip bun-e man-na-yo
　　Let’s meet at 4:10.

📌 Grammar Point: 「네 시」 uses a native Korean number, while 「십 분」 uses a Sino-Korean number. Korean time expressions often use both number systems together.

Cultural Notes:

1. When paying in Korea, prices are often expressed using units such as 「천、만」, followed by 「원」. Becoming familiar with combinations of 「천、만、원」 is more useful in real checkout situations than simply memorizing all the numbers from 1 to 100.
2. In spoken Korean, expressions such as 「몇 명」「몇 개」「몇 시」 are commonly used as fixed question patterns. Learning these questions first can make it easier to move into real conversations than memorizing number charts alone.
3. Telephone numbers are generally read digit by digit using Sino-Korean numbers. 0 is often read as 「공」 and can also be read as 「영」. For example, 010 can be read as 「공일공」 or 「영일영」. Room numbers and reservation numbers also generally use Sino-Korean numbers, but some are read digit by digit while others are read as complete numbers, depending on the convention used in a particular place.

How to Understand Korean 「Native Korean Numbers／Sino-Korean Numbers」 through Japanese 「Native Japanese Numerals／Sino-Japanese Numerals」

◆ Similar System: Japanese 「ひとつ／いち」 and Korean 「하나／일」

Japanese also distinguishes between native Japanese numerals and Sino-Japanese numerals, such as 「ひとつ、ふたつ」 and 「いち、に、さん」. Korean native and Sino-Korean numbers can be understood in a similar way, although Korean has a more clearly defined division of labor in everyday time expressions, age, and counters.

• Example: りんごを二つください。
  Kana: りんごを ふたつ ください。
  Translation: Please give me two apples.
  Japanese 「ふたつ」, like Korean 「두 개」, carries the sense of actually counting objects.
• Example: 今日は三月五日です。
  Kana: きょうは さんがつ いつかです。
  Translation: Today is March 5.
  Dates in both Japanese and Korean are closer to standardized numerical expressions, but Japanese dates themselves have many special readings, so Korean rules cannot be applied directly.

◆ Core Difference from 「Native Korean Numbers／Sino-Korean Numbers」:

In ordinary 12-hour Korean time expressions, hours are generally expressed with native Korean numbers, while minutes use Sino-Korean numbers. In formal 24-hour time, hours from 13 onward often switch to Sino-Korean numbers as well. Japanese time expressions do not have the same issue of mixing two number systems, but times such as 「四時、七時、九時」 have fixed special readings.

It is easy to memorize Korean numbers as two complete charts, only to hesitate between 「하나」 and 「일」 when you actually need to speak. The problem is often that the numbers were not learned together with their counters. Expressions such as 「한 개、두 잔、세 명、네 시」 can be learned as complete units, while dates, prices, and floors can be memorized in combinations such as 「삼월、오천 원、이 층」. As for 「번」, use 「한 번」 when it refers to frequency, and read it as 「1번／일 번」 when it refers to a number.

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