Korean Numbers: A Complete Guide to Counting from 1 to 100

Learning to count in a new language establishes an essential foundation for communication. Korean numbering systems present a unique challenge: unlike many Western languages, Korean utilizes two distinct counting systems with specific applications. This comprehensive guide will equip you with the knowledge to navigate Korean numbers effectively, whether for travel, business, or personal enrichment.

Why Korean Numbering Systems Matter

Before delving into specifics, understanding the significance of mastering Korean numbers cannot be overstated. Beyond basic counting, number proficiency enables:

Negotiating prices confidently in markets

Scheduling appointments precisely

Navigating transportation systems independently

Comprehending addresses, phone numbers, and other critical information

Most importantly, Korean numbers form the backbone of everyday transactions and social interactions.

The Dual Korean Counting Systems: An Overview

Korean utilizes two parallel counting systems that serve different purposes:

Sino-Korean Numbers (한자어 숫자, hanja-eo sutja): Derived from Chinese numerical systems, these numbers handle dates, currency, phone numbers, addresses, and quantities above 100.

Native Korean Numbers (고유어 숫자, goyu-eo sutja): Indigenous to the Korean language, these numbers count objects, people, hours, and age up to 99.

This dual-system approach might initially appear daunting, but with targeted practice, you'll intuitively know which system applies to different scenarios.

Mastering Korean Counting Fundamentals

Successful counting in Korean relies on several foundational principles:

Pronunciation shifts: When certain numbers combine, sound changes occur according to Korean phonological rules, creating smoother speech patterns.

Counter words: Korean uses specific measuring terms (counters) that vary based on what's being counted—objects, people, animals, or abstract concepts.

System selection: Determining when to use Sino-Korean versus Native Korean numbers follows logical patterns based on context.

Let's examine each counting system in detail.

Sino-Korean Numbers: Origins and Applications

The Sino-Korean numerical system emerged from China's historical influence on Korean language and culture. Before the creation of Hangul (the Korean alphabet) in the 15th century, Koreans relied heavily on Chinese characters (Hanja) for written communication.

This system exhibits notable advantages:

More predictable and systematic for numbers above 10

Used more frequently in daily life

Required for all numbers above 100

Essential for financial transactions, calendar dates, and mathematical operations

When to Use Sino-Korean Numbers

Sino-Korean numbers are the appropriate choice for:

Calendar dates (years, months, days)

Monetary amounts

Mathematical calculations

Phone numbers

Addresses

Quantities exceeding 100

Minutes and seconds when telling time

Native Korean Numbers: Origins and Practical Uses

The Native Korean number system predates Chinese influence, representing indigenous Korean numerical concepts. While limited to values below 100, these numbers fulfill critical functions in everyday conversation.

Key characteristics include:

Unique forms for numbers 1-99

More complex phonological patterns

Essential for counting objects and people

Required for expressing age and hours

When to Use Native Korean Numbers

Native Korean numbers are employed for:

Counting objects with counter words

Telling time (hours only)

Expressing age

Counting people, animals, or things

Sequential counting (first, second, third)

Practical Applications: System Selection in Context

Context determines which number system to use. Consider these essential everyday examples:

Expressing dates: May 7, 2025 is 이천이십오년 오월 칠일 (i-cheon-i-sip-o-nyeon o-wol chil-il), using Sino-Korean numbers exclusively.

Phone numbers: The number 010-5678-1234 is spoken as 공일공-오육칠팔-일이삼사 (gong-il-gong o-yuk-chil-pal il-i-sam-sa), with Sino-Korean digits.

Telling time: 3:45 PM combines both systems: 오후 세 시 사십오 분 (o-hu se si sa-sip-o bun). Here, the hour uses Native Korean (세), while minutes employ Sino-Korean (사십오).

Age: A 27-year-old person is 스물일곱 살 (seumul-ilgop sal), using Native Korean with the counter 살 (sal).

This hybrid approach to counting might seem complex initially, but with practice, it becomes second nature.

Korean Numbers 1-10: Building Blocks of Counting

The numbers 1-10 form the foundation for all Korean counting. Mastering these is essential before progressing to larger values.

Sino-Korean Numbers 1-10

1: 일 (il)

2: 이 (i)

3: 삼 (sam)

4: 사 (sa)

5: 오 (o)

6: 육 (yuk)

7: 칠 (chil)

8: 팔 (pal)

9: 구 (gu)

10: 십 (sip)

Native Korean Numbers 1-10

1: 하나 (hana)

2: 둘 (dul)

3: 셋 (set)

4: 넷 (net)

5: 다섯 (daseot)

6: 여섯 (yeoseot)

7: 일곱 (ilgop)

8: 여덟 (yeodeol)

9: 아홉 (ahop)

10: 열 (yeol)

Crafting Numbers 11-100 in Korean

Once you've mastered the basics, constructing larger numbers follows logical patterns in both systems.

Sino-Korean Numbers 11-100

The Sino-Korean system builds numbers by combining digits additively:

11-19: 십 (10) + single digit (e.g., 11 = 십일, sip-il)

20-99: [tens digit] + 십 + [ones digit]

Examples:

25: 이십오 (i-sip-o) = 2(이) × 10(십) + 5(오)

67: 육십칠 (yuk-sip-chil) = 6(육) × 10(십) + 7(칠)

82: 팔십이 (pal-sip-i) = 8(팔) × 10(십) + 2(이)

Phonological Changes in Sino-Korean Numbers

When specific consonants and vowels combine, pronunciation shifts occur to maintain fluidity:

십일 (11): pronounced "sib-il" (not "sip-il")

십이 (12): pronounced "sib-i" (not "sip-i")

십오 (15): pronounced "sib-o" (not "sip-o")

십육 (16): pronounced "sim-nyuk" (not "sip-yuk")

These sound changes reflect Korean linguistic patterns where adjacent sounds influence each other.

Native Korean Numbers 11-100

The Native Korean system employs unique terms for multiples of ten, with combinations for intermediate values:

11-19: 열 (10) + single digit (e.g., 11 = 열하나, yeol-hana)

20: 스물 (seumul)

30: 서른 (seoreun)

40: 마흔 (maheun)

50: 쉰 (swin)

60: 예순 (yesun)

70: 일흔 (ilheun)

80: 여든 (yeodeun)

90: 아흔 (aheun)

Intermediate values combine tens with single digits:

23: 스물셋 (seumul-set) = 20(스물) + 3(셋)

56: 쉰여섯 (swin-yeoseot) = 50(쉰) + 6(여섯)

91: 아흔하나 (aheun-hana) = 90(아흔) + 1(하나)

Beyond 100: Navigating Larger Korean Numbers

For values exceeding 100, Korean exclusively employs the Sino-Korean system with key power-of-ten markers:

100: 백 (baek)

1,000: 천 (cheon)

10,000: 만 (man)

100,000,000: 억 (eok)

1,000,000,000,000: 조 (jo)

The Korean Counting Unit System

Critical to understanding large Korean numbers is recognizing that Korean groups digits in units of 10,000 (만) rather than 1,000 as in Western systems.

Examples:

123,456: 십이만 삼천사백오십육 (sip-i-man sam-cheon-sa-baek-o-sip-yuk)

12(십이) × 10,000(만) + 3(삼) × 1,000(천) + 4(사) × 100(백) + 56(오십육)

8,675,309: 팔백육십칠만 오천삼백구 (pal-baek-yuk-sip-chil-man o-cheon-sam-baek-gu)

867(팔백육십칠) × 10,000(만) + 5(오) × 1,000(천) + 3(삼) × 100(백) + 9(구)

This grouping by 10,000 represents a fundamental difference from Western numerical organization and requires deliberate practice to master.

Phonological Changes in Large Numbers

Similar to smaller numbers, certain sound changes occur with larger values:

백만 (1,000,000): pronounced "baeng-man" (not "baek-man")

십억 (1,000,000,000): pronounced "sib-eok" (not "sip-eok")

These adjustments ensure fluid pronunciation in natural speech.

The Concept of Zero in Korean

Korean has two distinct terms for zero, each with specific applications:

영 (yeong): Used for decimal points, temperatures, and the 24-hour clock Example: 0.5 = 영 점 오 (yeong jeom o)

공 (gong): Primarily used in sequences like phone numbers Example: 010-8765-4321 = 공일공-팔칠육오-사삼이일 (gong-il-gong pal-chil-yuk-o sa-sam-i-il)

The context determines which zero term is appropriate.

Korean Counting Words: The Counter System

Counter words (classifier nouns) represent a crucial aspect of Korean counting that doesn't exist in English. These words follow numbers and indicate what type of object is being counted.

Key Features of Korean Counter Words

Counter words change based on the noun category (people, animals, objects)

When using counters, certain Native Korean numbers adopt shortened forms:

하나 → 한 (han)

둘 → 두 (du)

셋 → 세 (se)

넷 → 네 (ne)

스물 → 스무 (seumu)

Essential Korean Counters

개 (gae): General counter for inanimate objects Example: 책 다섯 개 (chaek daseot gae) = five books

명 (myeong): Counter for people (neutral) Example: 학생 세 명 (haksaeng se myeong) = three students

분 (bun): Counter for people (respectful) Example: 선생님 두 분 (seonsaengnim du bun) = two teachers

마리 (mari): Counter for animals Example: 고양이 네 마리 (goyangi ne mari) = four cats

병 (byeong): Counter for bottles Example: 맥주 여섯 병 (maekju yeoseot byeong) = six bottles of beer

잔 (jan): Counter for cups/glasses Example: 커피 한 잔 (keopi han jan) = one cup of coffee

살 (sal): Counter for age Example: 서른다섯 살 (seoreun-daseot sal) = thirty-five years old

The appropriate counter depends entirely on what's being counted, making this system nuanced but logical once understood.

Korean Ordinal Numbers: Expressing Sequence

Ordinal numbers indicate position or order in a sequence. Korean offers two methods for expressing ordinals:

Everyday Ordinals: Number + 번째 (beonjjae)

This format uses Native Korean numbers (1-99) or Sino-Korean numbers (100+) followed by 번째:

First: 첫 번째 (cheot beonjjae) - Note this unique form, not 한 번째

Second: 두 번째 (du beonjjae)

Fifth: 다섯 번째 (daseot beonjjae)

Twenty-third: 스물세 번째 (seumul-se beonjjae)

Formal Ordinals: 제 (je) + Number

Used primarily in formal documents, this format exclusively employs Sino-Korean numbers:

First chapter: 제일장 (je-il-jang)

Third section: 제삼절 (je-sam-jeol)

Tenth paragraph: 제십항 (je-sip-hang)

This system appears frequently in academic works, legal documents, and formal writing.

Number-Based Expressions in Korean Culture

Beyond basic counting, numbers in Korean carry cultural significance and appear in common expressions:

Lucky and Unlucky Numbers

Lucky numbers: 3, 7, and 8 are considered fortuitous in Korean culture

Unlucky numbers: 4 is avoided as its pronunciation (사, sa) resembles the word for death

These associations influence everyday decisions from apartment numbers to wedding dates.

Common Numerical Expressions

일거양득 (il-geo-yang-deuk): "One action, two gains" - equivalent to "killing two birds with one stone"

삼세번 (sam-se-beon): "Three times" - indicates persistence or the idea that "third time's a charm"

십중팔구 (sip-jung-pal-gu): "Eight or nine out of ten" - meaning "most likely" or "probably"

These expressions demonstrate how numbers are woven into the cultural fabric of Korean communication.

Practical Tips for Mastering Korean Numbers

Developing proficiency with Korean numbers requires deliberate practice:

Start with frequency: Focus first on the numbers you'll use most often (phone numbers, prices, dates)

Context-based learning: Practice numbers in realistic situations rather than memorizing isolated lists

Mnemonic techniques: Create visual or verbal associations to remember challenging numbers

Digital tools: Utilize number-focused flashcard apps with audio components for pronunciation practice

Regular reinforcement: Incorporate number practice into daily activities like reading prices, checking time, or calculating costs

The key lies in consistent, context-rich practice rather than rote memorization.

Common Mistakes to Avoid When Using Korean Numbers

Even advanced learners occasionally struggle with Korean numbering systems. Watch for these common pitfalls:

System confusion: Using Native Korean numbers when Sino-Korean is appropriate (or vice versa)

Counter mismatches: Applying the wrong counter word for the object being counted

Abbreviated form oversights: Forgetting to shorten certain Native Korean numbers when using counters

Pronunciation errors: Missing sound changes that occur when specific numbers combine

Group-of-10,000 miscalculations: Applying Western thousands-based grouping to large numbers instead of the Korean 10,000-based system

Awareness of these potential errors accelerates learning and improves accuracy.

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