Free · No sign-up · Phone and computer
Kraepelin Test PracticeAdd neighboring digits and answer the last digit
This follows tes koran (Kraepelin style): work up each vertical column from the bottom. Add the two highlighted digits and tap the last digit of the sum; it is written to the right between them (7 + 5 = 12 → 2). Every 30 seconds you move to the column on the right.
Score (correct − wrong)
0
When you finish the last column, the score is collected anonymously. No name is sent.
How to practice
- Choose 5 or 10 columns and press “Start”. First-timers get 3 untimed practice questions.
- Starting at the bottom of the column, add the two highlighted digits and tap the last digit. The answer is written to the right and the highlight moves up one. Mistakes stay; just keep going.
- After 30 seconds the “Next column!” signal moves you to the column on the right, starting from the bottom again. When all columns are done you see your score, accuracy and answers per column. On a computer you can type the number keys.
The Kraepelin test is a work-sample test of continuous single-digit addition, based on research by the German psychiatrist Emil Kraepelin. In Indonesia it is used as “tes koran” in civil service and company selection: vertical columns are worked from the bottom up, and each signal moves you one column to the right. This page is a practice tool for getting used to the format. It is not affiliated with any official test and does not assess personality or aptitude.
Rating guide
The ratings are this site’s own guide based on points per 30-second column. They differ from the scoring of real tests.
| Points per column | Rating | Comment |
|---|---|---|
| 0–9 | Warming up | Focus on accuracy first and find your rhythm. |
| 10–14 | Typical | About the same pace as most people. |
| 15–19 | Good | Steady and fast calculation. |
| 20–24 | Very good | Very fast and accurate. |
| 25+ | Top level | Speed that would hold up on the real test. |
Why your results change
- Familiarity with sums: The faster you know common pairs (7 + 8, 9 + 6…), the faster you go.
- Input speed: A phone keypad and a computer number row feel different.
- Sustained focus: Answers often drop in later columns, so the per-column counts show how steady your pace is.
- Condition: Tiredness or sleepiness tends to increase mistakes.
Tips for a higher score
- Do not work out the full sum; think only of the last digit (7 + 8 → “5”).
- Remember that pairs making 10 (1 and 9, 2 and 8…) always end in 0.
- Make accuracy steady before chasing speed; mistakes subtract points.
- Keep the same rhythm when the column changes.
Frequently asked questions
Is it the same as the real test?
Like tes koran, you work up vertical columns, write each answer to the right and move right on each signal. Real tests use many more columns, longer time and different scoring. This page is for getting used to the format.
How many should I answer per column?
This page treats 15–19 points per 30-second column as “typical”. With practice, 20 or more is well within reach.
What happens when I make a mistake?
You still move on to the next pair. Your score is correct answers minus mistakes, so answering carefully beats rushing.
Can I use it to practice for tes koran?
Yes. Indonesia’s tes koran uses the same continuous addition format, and there is an Indonesian version of this page.
Is my result sent anywhere?
When you finish the last column, the score, practice time, length, your device type (computer, phone or tablet) and the page language are sent. No name or email is collected, and IP addresses are not stored with scores. Unfinished tests are not sent. Your personal best is stored only in this browser.