Continuous addition
Add each pair of digits next to each other. Type only the last digit of the sum.
Example
Example
An example to explore. No score or practice round is recorded.
3 rows, 30 seconds each. Each level is more rows, so you hold the pace for longer.
3 rows · 30 seconds each
- Rows finished
- 0 / 3
- Active time
- 0:00
Add each pair of digits
The pair to add is marked in the row and named above it. The mark moves one place right each time you type.
- Correct answers
- 0
- Active time
- Errors
- 0
Answers by row
Compare how many pairs you answered in each row and how many were wrong.
This page is a place to get used to the pace. It is not the scored test. Nothing here is a result an employer would accept.
| Row | Answers | Errors |
|---|
Explore the method
Add digits that sit next to each other, keep only the last digit, and hold one pace across the row.
On by default unless you turn it off. Saved choices are kept. Shares starts, completions, replays and error categories. For ChatGPT visits, starts and completions may include the first QuickenBrain page and country. No answers, drawings or names.
How this data is usedHelp
This is the continuous addition task from the Uchida Kraepelin test (内田クレペリン検査). Many people in Japan take that test for a job or a license. The real test is 15 rows of one minute, a break, then 15 more.
This page is a place to get used to the pace. It is not the scored test. Nothing here is a result an employer would accept.
The digits here are 3 to 9, so more sums pass ten than in the real test.
Your numbers say how many pairs you added in these rows on this day, and how many you got wrong. They do not measure your ability, your character or your fitness for a job.
Level 1 is 3 rows of 30 seconds. Level 2 is 5 rows of 45 seconds. Level 3 is 8 rows of 60 seconds. Level 4 is 15 rows of 60 seconds, which is the first half of the real test.
About this practice
How to play
If you lose your place, take the marked pair and go on from there.
Only the last digit matters, so you never carry. Keep the same pace from the start of a row to the end of it.
Wrong answers are not shown while a row runs, the same way the real test does not show them. They are counted and reported at the end.
Finish every row to save a result in this browser. A round you end early is not saved. Leaving this tab ends the round.
The keys 0 to 9 answer the current pair. The buttons below the row do the same thing. Press Escape or End to stop the round.
Your result is kept in this browser only. It is not sent anywhere unless you choose to compare it.
Learn a method
Keep a steady paceAdd each pair of digits next to each other. Type only the last digit of the sum.
Report a problem
On by default unless you turn it off. Saved choices are kept. Shares starts, completions, replays and error categories. For ChatGPT visits, starts and completions may include the first QuickenBrain page and country. No answers, drawings or names.
How this data is used