Korean Reps keeps an anonymous record of each answer: the question, and which option was picked. Below are the totals from 1,903 answers in 172 practice sessions, up to October 22, 2026. There are no accounts, and the site maker's own test sessions are left out.
Korean numbers
The mistake learners pick most is "Native vs Sino-Korean numbers": 43% of all 215 wrong answers in the numbers drill.
| Situation | Answers | Missed |
|---|---|---|
| Counters (개, 명, 마리…) | 605 | 18% |
| How long (시간) | 40 | 18% |
| Age (살) | 455 | 16% |
| Clock time (시, 분) | 91 | 12% |
| Dates (년, 월, 일) | 102 | 9% |
| Prices (원) | 43 | 5% |
| Phone numbers | 63 | 3% |
| Mistake picked | Wrong answers | Share |
|---|---|---|
| Native vs Sino-Korean numbers | 93 | 43% |
| Wrong number | 66 | 31% |
| Short forms before counters | 38 | 18% |
| Wrong short form | 8 | 4% |
| 유월 and 시월 | 5 | 2% |
| Other mistakes | 5 | 2% |
Ages 1 to 10
Ages use native numbers with 살. Each age has its own trap: the short forms 한, 두, 세, 네 before 살, the Sino-Korean numbers, or a neighboring number. The last column shows the mistake picked most for each age, when at least 3 learners picked it.
| Age | Say | Answers | Missed | Mistake picked most |
|---|---|---|---|---|
| 1 | 한 살 | 35 | 6% | — |
| 2 | 두 살 | 40 | 23% | Short forms before counters (5) |
| 3 | 세 살 | 42 | 17% | Short forms before counters (4) |
| 4 | 네 살 | 38 | 18% | Short forms before counters (4) |
| 5 | 다섯 살 | 45 | 7% | — |
| 6 | 여섯 살 | 41 | 17% | Native vs Sino-Korean numbers (5) |
| 7 | 일곱 살 | 34 | 24% | Native vs Sino-Korean numbers (5) |
| 8 | 여덟 살 | 43 | 19% | Wrong number (6) |
| 9 | 아홉 살 | 42 | 19% | Wrong number (5) |
| 10 | 열 살 | 36 | 17% | Native vs Sino-Korean numbers (5) |
Practice ages: Korean Age Drill
Counters
| Counter | Answers | Missed |
|---|---|---|
| 개 (things) | 108 | 19% |
| 명 (people) | 177 | 19% |
| 병 (bottles) | 95 | 18% |
| 잔 (cups) | 102 | 18% |
| 마리 (animals) | 92 | 14% |
Practice counters: Korean Counters Drill
Korean particles
Particle totals start on October 19, 2026. On October 18, 2026 the Level 1 questions stopped showing a spaced option such as 책 을, so earlier answers are left out. The particle question missed most is 아니에요: 22% of 32 answers.
| Question | Answers | Missed |
|---|---|---|
| Form: 아니에요 | 32 | 22% |
| Form: 과/와 | 34 | 15% |
| Form: 이에요/예요 | 62 | 15% |
| Verbs that take 이/가 or 을/를 | 102 | 11% |
| Form: 으로/로 | 30 | 10% |
| Form: 을/를 | 62 | 8% |
| Form: 이/가 | 56 | 5% |
| Form: 은/는 | 63 | 5% |
| Places: 에 or 에서 | 63 | 2% |
| Mistake picked | Wrong answers | Share |
|---|---|---|
| 이에요, 예요 and 아니에요 | 16 | 34% |
| Forms after a consonant or a vowel | 13 | 28% |
| 좋다 vs 좋아하다 | 7 | 15% |
| No space before a particle | 3 | 6% |
| Other mistakes | 8 | 17% |
Practice particle forms: Korean Particle Forms Drill
How these numbers are counted
- Only totals are shown. A single question is listed only when it has been answered at least 30 times, and a group of questions only when the group has at least 30 answers.
- A mistake can only be picked when the drill shows it as an option, so the shares of wrong answers lean toward the options the drill shows most often.
- Number totals start on October 8, 2026, when the site opened.
- This page is updated from time to time. The date in the first paragraph shows the latest update.
- What the drills record, and what they never record: Privacy