Recognizing Numbers, Prices & Times

SECTION 1

Historical Context & Motivation

Numbers are the backbone of daily life in any language—ordering food, paying for a bus fare, scheduling a meeting, or reading a calendar. In Korean, though, there is a twist that surprises many learners: the language uses two entirely separate number systems side by side. One set of numbers is native Korean, rooted in the peninsula's ancient oral traditions. The other set was borrowed from Chinese characters (한자, hanja) centuries ago. Understanding why two systems coexist—and when to use each—gives you a huge head start in listening and reading comprehension.

~57 BCE

Three Kingdoms Period

The earliest Korean kingdoms—Goguryeo, Baekje, and Silla—develop their own counting words for everyday objects and ages. These native Korean (고유어) numbers are still used today for counting items and telling hours.

~600 CE

Chinese Character Adoption

Chinese writing and number characters (한자) spread through education, government, and Buddhism. Korean scholars adopt Sino-Korean (한자어) numbers for official documents, dates, money, and mathematics.

1443

Invention of Hangul

King Sejong the Great creates the Korean alphabet, 한글 (Hangul). Both number systems can now be written in a phonetic script accessible to all Koreans, not just the scholarly elite.

1962

Korean Won Currency

South Korea re-introduces the 원 (won) as its currency unit. All prices are expressed with Sino-Korean numbers, making this system essential for shopping, dining, and travel.

Present

Dual System in Daily Life

Modern Korean speakers switch fluidly between native and Sino-Korean numbers depending on context—hours vs. minutes, age vs. phone numbers, counting objects vs. reading addresses.

So the central question for any Korean learner is: Which number system do I listen for, and when? This lesson will equip you to recognize numbers in prices, clock times, dates, and common quantities—covering the most frequent real-world situations you will encounter in Korean listening and reading.

SECTION 2

Core Principles & Definitions

Before diving into specific numbers, let's establish the foundational ideas that govern how Korean numbers work. Grasping these principles will help you quickly decode any number you hear or read, even if you haven't memorized every single word yet.

Two Number Systems

Sino-Korean (한자어) numbers (일, 이, 삼…) are used for money, dates, minutes, phone numbers, and addresses. Native Korean (고유어) numbers (하나, 둘, 셋…) are used for counting objects, hours on the clock, and ages.

Context Determines the System

There is no random choice between the two systems. The context—whether you are talking about money, time, age, or quantity—tells you which system to use. Memorize the contexts, not just the numbers.

Counters (단위) Are Essential

Korean uses special counting words called counters (단위). For example, 개 (gae) counts general objects, 명 (myeong) counts people, and 원 (won) counts money. The counter often signals which number system is being used.

Native Numbers Change Form

The native numbers 하나, 둘, 셋, 넷, and 스물 shorten when they appear directly before a counter: 한 개, 두 개, 세 개, 네 개, 스무 개. Recognizing these shortened forms is crucial for listening.

Large Numbers Follow Sino-Korean

Native Korean numbers only go up to 99 in modern usage. For numbers 100 and above—especially prices—Korean always uses the Sino-Korean system. This is why prices are always Sino-Korean.

✦ KEY TAKEAWAY

Think of the two Korean number systems like two playlists on your phone. You don't randomly shuffle between them—each playlist has its own occasion. Sino-Korean is your 'official business' playlist (money, dates, minutes, phone numbers), while native Korean is your 'everyday counting' playlist (objects, hours, ages). Once you learn which playlist to expect, recognizing the right numbers becomes almost automatic.

SECTION 3

Visual Explanation — The Two Number Systems

The diagram below lays out the Sino-Korean and Native Korean numbers from 1 to 10 side by side, along with the key contexts where each system is used. Refer to this chart whenever you need a quick lookup.

The left column shows Sino-Korean numbers (violet) with their Romanization. The right column shows Native Korean numbers (cyan) with both the full form and the shortened form (marked with →) used before counters. Below each column, icons indicate the primary contexts where each system is used.

Notice how the Sino-Korean side has simple, mostly one-syllable words (일, 이, 삼), which is why they are efficient for large numbers like prices. The Native Korean side has longer words (다섯, 여섯, 일곱), but they feel natural in casual speech when you are counting objects or telling someone the hour. The shortened forms (한, 두, 세, 네) only apply to numbers 1–4 and 20; the rest stay the same before counters.

SECTION 4

How Numbers Build — Tens, Hundreds & Thousands

Korean numbers beyond 10 follow predictable patterns. Once you know the building blocks, you can construct—or decode—any number you hear. Let's look at how each system scales up.

Sino-Korean: Place-Value Building Blocks

SINO-KOREAN PLACE VALUES

십 (10) · 백 (100) · 천 (1,000) · 만 (10,000)

Combine a digit + place-value word: 이십 (20) = 이(2) + 십(10), 삼백 (300) = 삼(3) + 백(100), 오천 (5,000) = 오(5) + 천(1,000). For 만, note that Korean groups large numbers by 10,000, not 1,000 as in English.

EXAMPLE: BUILDING 4,500

사천오백 = 사(4) × 천(1,000) + 오(5) × 백(100)

Read left to right: 사천 (4,000) then 오백 (500). This is identical to how you'd say 'four thousand five hundred' in English, just with Korean words.

Native Korean: Tens (11–99)

NATIVE KOREAN TENS

열(10) · 스물(20) · 서른(30) · 마흔(40) · 쉰(50) · 예순(60) · 일흔(70) · 여든(80) · 아흔(90)

Each ten has its own unique word. Combine the ten with a single digit: 스물다섯 (25) = 스물(20) + 다섯(5). Native numbers above 99 are almost never used in modern Korean; switch to Sino-Korean for 100+.

The 만 (man) System — Grouping by 10,000

One concept that trips up English speakers is the 만 (man) unit, meaning 10,000. While English counts thousands (1,000 → 10,000 → 100,000), Korean resets at 만. For example, 50,000 is 오만 (o-man), literally "five ten-thousands." This matters a lot for prices: a 50,000₩ bill is 오만 원. Similarly, 100,000 is 십만 (sip-man, "ten ten-thousands"), and 1,000,000 is 백만 (baek-man, "hundred ten-thousands"). Getting comfortable with 만 is essential for understanding Korean prices, which frequently reach into the thousands and ten-thousands of won.

💡 PRO TIP

When listening for prices, focus on the place-value words (천, 백, 십) as anchors. If you catch '천' you know you're in the thousands range. Then fill in the digit words around it.

SECTION 5

Detailed Breakdown — Prices, Times & Dates

Now let's connect the number systems to the three most common real-world contexts you will encounter: prices, clock times, and dates. Each context has a fixed formula, so once you learn the pattern, you can decode any example that follows it.

Three context cards (Prices, Clock Time, Dates) show the formula and examples for each. The flowchart at the bottom provides a quick decision path: identify the context first, then apply the correct number system.

Months of the Year

Months use Sino-Korean number + 월. Watch for the irregular pronunciations in June and October.

Month #	Korean	Romanization	Special Note
1	일월	ir-wol	—
2	이월	i-wol	—
3	삼월	sam-wol	—
4	사월	sa-wol	—
5	오월	o-wol	—
6	유월	yu-wol	육월 → 유월 (sound change)
7	칠월	chir-wol	—
8	팔월	par-wol	—
9	구월	gu-wol	—
10	시월	si-wol	십월 → 시월 (sound change)
11	십일월	sib-ir-wol	—
12	십이월	sib-i-wol	—

⚠️ WATCH OUT

June and October have irregular pronunciations: 유월 (not 육월) and 시월 (not 십월). These are the two months Korean learners most commonly get wrong, so flag them in your memory!

SECTION 6

Worked Example — Decoding a Korean Conversation

Imagine you overhear the following Korean sentence at a café. Let's decode it step by step to extract the price, time, and date mentioned.

🎧 OVERHEARD AT A CAFÉ

"오늘은 삼월 이십일일이에요. 세 시 사십오 분에 만나요. 커피는 사천오백 원이에요."

Decoding the Sentence

Step 1 — Identify the DateLook for the date markers 월 (month) and 일 (day). We see 삼월 (sam-wol) = March, and 이십일일 (i-sib-il-il). Break this down: 이십일 (21) + 일 (day marker).

Date = March 21st (삼월 이십일일)

Step 2 — Identify the TimeLook for 시 (hour) and 분 (minute). We see 세 시 — '세' is the shortened native Korean form of 셋 (3), so the hour is 3 o'clock. Then 사십오 분 — 사십오 is Sino-Korean for 45, and 분 means minutes.

Time = 3:45 (세 시 사십오 분)

Step 3 — Identify the PriceLook for 원 (won). We see 사천오백 원. Break it down: 사(4) × 천(1,000) = 4,000 plus 오(5) × 백(100) = 500. Total = 4,500 won.

Price = 4,500₩ (사천오백 원)

Step 4 — Put It All TogetherFull translation: "Today is March 21st. Let's meet at 3:45. The coffee is 4,500 won." Notice how we used native Korean for the hour (세 시) and Sino-Korean for everything else (date, minutes, price).

Successfully decoded: Date (March 21), Time (3:45 PM), Price (4,500₩)

SECTION 7

Strengths & Common Pitfalls

Knowing both number systems is powerful, but it also creates opportunities for confusion. The table below highlights the most common areas where learners succeed or stumble when listening for numbers in Korean.

Summary of strengths and common pitfalls when recognizing numbers in Korean.

Context	What Works Well	Common Pitfall
Prices	Always Sino-Korean + 원, so no system confusion. Prices follow a consistent pattern.	The 만 (10,000) grouping confuses English speakers. 50,000₩ = 오만, not 오십천.
Clock Time	시 and 분 are clear markers that anchor the hour and minute.	Mixing systems: using Sino-Korean for hours (삼 시) instead of Native Korean (세 시).
Dates	All Sino-Korean, and the year-month-day order matches Korean writing conventions.	June (유월) and October (시월) irregular forms are easy to miss in fast speech.
Counting Objects	Native Korean + counter (개, 명, 잔…) feels natural once practiced.	Forgetting the shortened forms: saying 하나 개 instead of 한 개.
Age	Native Korean + 살 is the casual, everyday way to state age.	Korea also uses 세 (Sino-Korean) for formal age; context tells you which system is in play.

✦ KEY TAKEAWAY

The biggest listening strategy is to listen for the counter word first (원, 시, 분, 월, 일, 개, 살) because it immediately tells you both the context and which number system was just used. It's like hearing 'dollars' in English—you instantly know the preceding words were a price, even if you only caught part of the number.

SECTION 8

Connection to Advanced Korean

Once you are comfortable recognizing clearly stated numbers, prices, and times, you are ready to tackle more nuanced situations. Advanced Korean listening involves numbers embedded in rapid speech, idiomatic expressions with numbers, and cultural contexts that require deeper understanding.

How today's skills connect to intermediate and advanced Korean listening.

This Lesson (Beginner)	Next Level (Intermediate/Advanced)
Clearly stated numbers at normal speed	Numbers in fast speech with sound changes (연음, linking)
Standard prices: 사천오백 원	Negotiation language: 좀 깎아 주세요 (Please give me a discount)
Basic clock time: 세 시 삼십 분	Duration and scheduling: 세 시간 반 동안 (for 3.5 hours)
Calendar dates: 삼월 십사일	Historical dates, holidays, and ordinal days (첫째 날, 둘째 날…)
Simple counters: 개, 명, 원	Specialized counters: 권 (books), 대 (vehicles), 벌 (clothing), 채 (buildings)

Additionally, understanding Korean age systems adds complexity. South Korea officially switched to the international age system (만 나이) in June 2023, but you may still hear people reference the traditional Korean age (한국 나이) where you are one year old at birth. Being aware of this cultural nuance will help you interpret ages you hear in conversation. The number skills from this lesson form the foundation for all of these more advanced topics.

SECTION 9

Practice Problems

PROBLEM 1 — CONCEPTUAL

A Korean friend says the time is "네 시 이십 분." Which number system is used for the hour, and which is used for the minutes? Explain how you know.

PROBLEM 2 — BASIC CALCULATION

Convert the following price to a numeral: 만이천삼백 원. Show how you break down each place-value word.

PROBLEM 3 — INTERMEDIATE

You read the following on a Korean event poster: "이천이십오년 시월 셋째 주 토요일 두 시." Identify the year, month, day of the week, and time. Which word is irregular, and why?

PROBLEM 4 — APPLIED

You are at a Korean restaurant and the server says: "비빔밥 하나, 김치찌개 둘이요. 총 이만삼천 원이에요." How many of each item were ordered, and what is the total bill? Explain every number you identified and which system each belongs to.

PROBLEM 5 — CRITICAL THINKING

A Korean podcast host says: "저는 스물여섯 살이에요. 유월 십오일에 태어났어요. 매일 아침 일곱 시 삼십 분에 일어나요." Extract three pieces of numerical information. Then explain why the host uses native Korean numbers for some parts and Sino-Korean for others within the same sentence. What patterns or rules allow a listener to switch between systems in real time?

SUMMARY

Lesson Summary

Korean uses two number systems: Sino-Korean (한자어) numbers (일, 이, 삼…) for prices (원), dates (년/월/일), minutes (분), and phone numbers; and Native Korean (고유어) numbers (하나, 둘, 셋…) for hours (시), counting objects (개, 명), and ages (살). The counter word after the number is your listening anchor—it tells you the context and confirms which system is being used.

For prices, remember the place-value words 만 (10,000), 천 (1,000), 백 (100), 십 (10) and that Korean groups large numbers by 만, not by thousands. For clock time, use the hybrid formula: Native Korean + 시 for hours and Sino-Korean + 분 for minutes. For dates, everything is Sino-Korean (년, 월, 일), but watch for the irregular months 유월 (June) and 시월 (October). Master these patterns, and you will confidently decode numbers, prices, times, and dates in any Korean conversation.