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An interactive walkthrough
Two ways to count
Korean has two complete sets of numbers, learned side by side and used in strict division of labour. Which one you reach for depends on what you are counting; and telling the time forces you to use both at once. Four short modules; the numbers do the teaching.
Myth we'll unpick: "learning to count in Korean is learning one list"
It is two lists. One is native Korean, grown from the language itself; the other is Sino-Korean, built from Chinese roots. A learner has to hold both.
One language, two counting words for everything
Ask a Korean speaker for the number three and you can get 셋(set) or 삼(sam), and both are right; they just belong to different jobs. The first is a native Korean word, as old as the language. The second is Sino-Korean, borrowed from Chinese more than a thousand years ago, the way English borrowed its Latin numerals for the calendar and the clock.
Japanese has the same double system, for the same reason. English has a faint version of it too: we count one, two, three, but we say January is the first month, not the "oneth".
One to ten, both ways
Native Korean
Sino-Korean
The native set thins out fast; in everyday use it is rarely pushed past ninety-nine. The Sino set carries zero, the hundreds, and everything large. That division is Module 02.
How high each set really goes
Native Korean
Has its own words for the tens; 열 (10), 스물 (20), 서른 (30), on to 아흔 (90). It has no everyday word for zero, and its old words for a hundred and a thousand have fallen out of use, so in practice it stops around ninety-nine.
Sino-Korean
Runs without limit: 백 (100), 천 (1,000), 만 (10,000), 억 (100 million). It also has zero, 영 or 공. Large numbers, money and maths are all its work.
Korean groups large numbers in ten-thousands rather than thousands, so a million is 백만 (baengman), literally "a hundred ten-thousands".
Module 02
Which system, when
The choice is not free; each situation demands one set or the other. Learn the map of which goes where, and the rest is vocabulary.
Pick a situation
The clock makes you use both
The hour is native, the minutes are Sino-Korean, so a single time runs the two systems together in one breath. Half past three is 세 시 삼십 분, se si samsip bun: 세 (native three) for the hour, 삼십 (Sino thirty) for the minutes. Get the halves the wrong way round and you sound, to a Korean ear, like someone reading a clock in a language they half-know.
The counter for the hour is 시 (si); for minutes it is 분 (bun). The same syllable 분 is also the polite counter for people, one of many counters Module 03 introduces.
Module 03
Numbers that change shape
You rarely count in the bare numbers. You count with a counter word, and a handful of the native numbers quietly change form when a counter follows.
The counter word
Korean does not say "three dogs"; it says dogs, three head-of-animal: 개 세 마리, gae se mari. The counter names what kind of thing is being counted, the way English says two head of cattle or three sheets of paper, but Korean does it for everything. Different things take different counters: 개 for objects, 명 for people, 마리 for animals, 살 for years of age, 시 for the hour.
Watch the number change before the counter
Now you choose
Four apples. Objects take the native numbers and the counter 개; and 넷 (four) changes shape before a counter. So it is:
네 개 ne gae넷 shortens to 네. The pattern: apples first, then the number and counter; 사과 네 개, sagwa ne gae.
Twelve o'clock. The hour is native, with the counter 시; and 열둘 (twelve) changes before a counter. So it is:
열두 시 yeoldu si열둘 becomes 열두. The minutes, if you added them, would switch to Sino-Korean.
A coffee costs 4,500 won. Money is Sino-Korean. So it is:
사천오백 원 sacheon-obaek wonNo shape change at all; the Sino-Korean numbers never shorten before a counter. Only the native set does that, which is half of why the two are worth keeping straight.
Module 04
Where the two sets came from
Two number systems in one language is not clutter; it is a fossil record of contact, and Korean is not alone in carrying it.
Why a language keeps two
The native setThe native Korean numbers are inherited, part of the language's own oldest stock, and they attach to the counter words the culture built up for tallying concrete things; people, animals, objects, ages.This is the set that changes shape before a counter, a sign of how deeply worn-in it is.
The Sino setThe Sino-Korean numbers came in with centuries of Chinese literary and administrative influence, alongside the Hanja characters, and took over the work of writing; dates, money, measurement, mathematics, anything large or precise.Roughly half of the Korean vocabulary is Sino-Korean in origin; the numbers are only its most everyday face.
The parallelJapanese carries the very same split, native versus Sino-Japanese, for the same historical reason; sustained borrowing from Chinese laid a second numeral system over an older one.Where the two languages differ is in exactly which situations take which set.
The divideThe two Koreas have drifted in their vocabulary since 1945, and specialist and borrowed words have drifted most; but the two number systems and the division of labour between them are shared north and south.Some things are older and deeper than the politics laid over them.
Why this matters
Once you stop seeing two arbitrary lists and start seeing one native set for handling things and one borrowed set for measuring the world, the choice stops being memorisation and becomes a question you can answer: am I counting, or am I measuring? Korean asks it of you every time you tell the time.
Sources used: the native and Sino-Korean numeral systems and their division of usage are standard, uncontested descriptions of Korean; see Ho-min Sohn, The Korean Language (Cambridge, 1999), chapters on numerals and classifiers, and any standard reference grammar. The pre-counter forms (하나 to 한, 둘 to 두, 셋 to 세, 넷 to 네, 스물 to 스무) and the native-hour, Sino-minute clock convention are basic and agreed points of Korean grammar. Romanisation follows the Revised Romanisation of Korean. The parallel with Japanese and the Sino-Korean share of the lexicon are standard historical-linguistic observations.