How to Memorize Native Korean Numbers: a 5-Day Plan

How to Memorize Native Korean Numbers: What You Need First

Before you start, gather a list, audio and a way to test yourself. The plan covers the native Korean numbers from 하나 (1) to 아흔아홉 (99), which are the numbers used for counting objects, telling age and saying the hour. It does not cover the Sino-Korean numbers used for dates and prices.

Before You Start

• Time: 10 to 15 minutes a day, for five days.
• Difficulty: beginner.
• You need: the table of native Korean numbers 1-100 open in another tab, the audio buttons on this page, and 10 blank cards or a deck of native Korean numbers flashcards.
• Prerequisites: you can read Hangul and know the Sino-Korean numbers 1 to 10, covered in Sino vs native Korean numbers.
• Outcome: on day 5 you can say 1 to 10 and the tens 20 to 90 without notes, and build numbers such as 스물다섯 (25).

The whole schedule fits in one table. Each day adds one chunk and begins with a check of the days before.

The plan follows three memory methods. Chunking means studying a few items at a time, here four numbers in the first chunk and six in the second. Retrieval practice means saying the answer before you look, which strengthens memory more than reading the list again. Spaced review means returning to old items on later days. Each day below uses all three.

Step 1: Learn 하나 to 넷 in Short Forms

On day 1, learn 하나 (hana), 둘 (dul), 셋 (set) and 넷 (net), together with the short forms 한, 두, 세 and 네 that appear before a counter. These four numbers cover most everyday counting, so they come first.

1. Say the stand-alone forms ten times: 하나, 둘, 셋, 넷.
2. Attach each short form to a counter you know: 한 개 (one item), 두 명 (two people), 세 잔 (three cups), 네 권 (four books).
3. Say each phrase while you point at a real object, such as a cup or a book.

Success check: you will know it worked when you can say 하나 둘 셋 넷 in under five seconds and give the short form of each number without looking.

Common mistake: mixing in the Sino-Korean 일, 이, 삼, 사. Keep the two lists apart by saying out loud, "This list is for counting things." Also watch the word 네: it means "four" before a counter, as in 네 권, but it also means "yes" when it stands alone. The context tells them apart, and the next days will give you plenty of it.

Day 1 ends with a one-minute recall check: cover the table and say 1 to 4. Tomorrow starts with the same check, and then the list grows.

Step 2: Add 다섯 to 열

On day 2, start with the day 1 check, then add 다섯 (5), 여섯 (6), 일곱 (7), 여덟 (8), 아홉 (9) and 열 (10). Learn them in sound pairs, because pairs are easier to hold than a list of six separate words.

Two patterns do most of the work. First, the pairs 다섯-여섯 and 일곱-아홉 end alike, so you learn two rhymes and a loner, 여덟. Second, the even numbers 6, 8 and 10 all start with 여 (여섯, 여덟, 열), while the odd numbers 5, 7 and 9 do not (다섯, 일곱, 아홉). These hooks are memory aids and not etymology, but they work as a check: if you say 5 and it starts with 여, it is wrong.

Then say the whole run, 하나 to 열, three times at normal speed. Next, say it backwards from 열 to 하나, because reverse order exposes the weak spots.

Success check: you will know it worked when you can say 하나 to 열 in order in under ten seconds, and then 열 to 하나 in under fifteen.

Common mistake: crossing the native 일곱 with the Sino 일 (1) or 칠 (7), and the native 여덟 with the Sino 팔. The first sound of 일곱 is 일, the same as Sino 1, even though it means 7. Say 일곱 = 7 and 일 = 1 aloud together, ten times. Day 2 ends with the next exercise: count to ten while you climb stairs or walk the first ten steps of your street.

Step 3: Learn the Tens 스물 to 쉰

On day 3, start with the recall check for 1 to 10, then learn the first four tens: 스물 (20), 서른 (30), 마흔 (40) and 쉰 (50). Then learn how a ten and a unit join into one word: 스물하나 (21), 스물둘 (22), 서른다섯 (35), 쉰여섯 (56).

1. Say the four tens in a rhythm, such as "seu-mul, seo-reun, ma-heun, swin".
2. Add the units 1 to 9 to one ten, for example 스물하나, 스물둘, 스물셋 up to 스물아홉.
3. Swap in a different ten, and say 서른하나 to 서른아홉.
4. Use the short form with a counter, so 21 items is 스물한 개 and 20 items is 스무 개.

Notice that the word for exactly 20 changes to 스무 before a counter, but 21 uses 스물한. The short form 스무 appears only at 20. Written native numbers join without spaces, so 스물하나 is one word, but a counter after the number takes a space: 스물한 개.

Success check: you will know it worked when you can say the tens 20 to 50 in under five seconds and give 25 and 37 on request (스물다섯, 서른일곱).

Common mistake: saying 스물 개 for 20 items. The correct form is 스무 개. Also, do not guess the native tens from Sino numbers: 이십 is the Sino-Korean 20, not a native word. Speakers do switch to Sino numbers for larger counts (이십 개 is common for 20 items), but the native word to memorize here is 스물.

Step 4: Finish 예순 to 아흔

On day 4, review 1 to 50, then learn 예순 (60), 일흔 (70), 여든 (80) and 아흔 (90). Two patterns make these four easy. The tens 70, 80 and 90 start with the same first syllable as the digit: 일곱 and 일흔, 여덟 and 여든, 아홉 and 아흔. Also, three tens end in 흔: 마흔 (40), 일흔 (70) and 아흔 (90).

Now put the pieces together with a big number such as 아흔아홉 (99), the largest native number in everyday use. After 99, Korean returns to the Sino-Korean 백 (100). Read 예순 to 아흔 in a row, then read them with units: 예순일곱 (67), 일흔셋 (73), 여든여섯 (86), 아흔아홉 (99).

Success check: you will know it worked when you can say 60, 70, 80 and 90 in under five seconds without looking, and then say 67 and 99.

Common mistake: swapping 예순 (60) and 여든 (80), which both begin with a similar sound. Link each ten to its digit. 여든 starts with 여 like 여덟 (8), so 여든 is 80. By elimination, 예순 is 60.

Day 4 closes with the longest list yet. Recite 하나 to 열, then 스물 to 아흔, once through before bed.

Step 5: Mix and Test Yourself

On day 5, mix the numbers in random order and test yourself against a pass rule: 9 correct out of 10 in under 30 seconds, with no notes. If you pass, you are ready to move on. If not, repeat the weakest chunk and try again tomorrow.

Write ten numbers on slips of paper, shuffle, and say the native reading of each. A sample set is below, with the answers hidden in the next list.

1. 7
2. 14
3. 21
4. 38
5. 45
6. 52
7. 69
8. 73
9. 86
10. 99

Answers: 일곱, 열넷, 스물하나, 서른여덟, 마흔다섯, 쉰둘, 예순아홉, 일흔셋, 여든여섯, 아흔아홉.

Finish with the quiz below, which gives instant feedback. The Korean numbers quiz offers a longer set.

If you pass, the plan is done, and the next step is practice in real phrases, which the following sections cover.

What Mistakes Slow Learners Down?

Most slow progress comes from the same six habits. Check yourself against the list.

1. Reading the romanization instead of the Hangul. Romanization hides the spelling that you will have to read on signs, so treat it as a temporary aid.
2. Learning only 1 to 10. Ages and the hour need more. Learn the tens at least to 50 in the first week.
3. Studying silently. Say every number aloud, because the goal is spoken recall.
4. Cramming in one session. Five sessions of 10 to 15 minutes beat a single hour-long session, since each day gives a new recall check.
5. Skipping the short forms. Without 한, 두, 세, 네 and 스무, counter phrases come out wrong.
6. Mixing the systems. Tie each number to its job. Sino numbers read digits and prices. Native numbers count items, ages and hours.

Expert insight: the most useful memory habit is the first-thing-tomorrow check. Say yesterday's numbers before you open the table. If you hesitate, you have found the item to practise.

How Long Does This Really Take?

The plan itself takes about an hour in total, five sessions of 10 to 15 minutes. Passing the day 5 test is the goal of the plan, but recall a month later depends on use. A good rule of thumb is to repeat a short check on day 7 and again on day 14, and to meet the numbers in real phrases every few days. These are typical ranges and not measurements, because learners differ.

The plan memorizes the words and their joins. It does not teach which counter goes with which noun, or how to tell the hour. For those, move on to the 개 counter and the telling-time lessons.

Do I Really Need Numbers above 50 in Native Korean?

Yes, but less often than 1 to 50. Ages use native numbers all the way to 아흔아홉 살, so someone who is 67 is 예순일곱 살. The hour needs only 한 시 to 열두 시 (1 to 12 o'clock). Counting items above 50 is rare in daily speech. Learn the high tens on days 3 and 4 for ages, and spend your later practice time on 1 to 20.

Can You Adapt the Plan to Your Own Pace?

Yes, the plan stretches or shrinks. Three variations cover the most common situations.

• A slower pace: spread each step over two days, for a ten-day plan with five-minute sessions.
• A strong Sino background: learn the native numbers beside their Sino pairs, such as 7 as 칠 and 일곱, so each lookup reminds you of the other system.
• A speaking focus: do each step out loud, using the phrases 한 개, 두 명, 세 잔 and 네 권 at home, with real cups and books.

Use the phrases while you set the table, count the stairs or sort your books. The numbers stay when they are attached to real actions.

What to Learn Next

You now know how to memorize native Korean numbers in five days, and you have a daily habit to keep them fresh. Continue in this order:

• The 개 counter to put the numbers to work with objects.
• Native Korean numbers for the full section, including 1 to 100.
• Sino vs native Korean numbers to keep the two systems apart.
• Korean vocabulary flashcards to drill the words with audio.

Frequently Asked Questions

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