Free practice sitting

Flash anzan kentei 10 to 1 kyu: 2-digit numbers with carrying

At 10 kyu the numbers become two digits and carrying is allowed, so the sequences start short again: 2 numbers at 10 kyu, growing longer and faster to 15 numbers in 13 seconds at 1 kyu. The practice sitting below runs any of the ten levels.

10 levels
2-digit numbers
Carrying allowed
10 questions a sitting

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Choose a level

10 kyu2 × 2-digit, 4 s

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Choose a level from 10 to 1 kyu and start. The first levels give each number well over a second; by 1 kyu each is on screen for less than one, so it is worth sitting the levels in order.

The level's own pace

Every number gets an equal, frame-timed share of the level's total time, with a blank beat before the next one.

Ten fresh sequences

Each sitting draws ten new sequences built to the level's digit width, count and carrying rules.

Marked with the bands

70 or more passes and 50 or 60 is a semi-pass. Every missed sequence is then shown beside its total.

The levels in this tier

The rows for 10 to 7 kyu and 1 kyu are the Flash Anzan Kentei Association's published figures. The rows between them are Kani's settings, and they climb steadily from one published level to the next, so no single step in the tier is a jump.

10 to 1 kyu: digits, numbers and times

Level	Digits	Numbers	Total time	Per number
10 kyu	2	2	4 s	2 s
9 kyu	2	3	6 s	2 s
8 kyu	2	4	7 s	1.75 s
7 kyu	2	5	8 s	1.6 s
6 kyu	2	6	9 s	1.5 s
5 kyu	2	7	10 s	1.429 s
4 kyu	2	8	11 s	1.375 s
3 kyu	2	10	12 s	1.2 s
2 kyu	2	12	12 s	1 s
1 kyu	2	15	13 s	0.867 s

The Flash Anzan Kentei Association publishes 10 to 7 kyu and 1 kyu. The rows for 6 to 2 kyu are Kani practice settings, placed between the published levels on either side.

What these levels ask

Carrying is the new skill of this tier. 10 kyu flashes just 2 numbers of 2 digits in 4 seconds, 2 seconds each, so all the attention can go on the carry itself. Up to 7 kyu the count rises by one a level, reaching 5 numbers in 8 seconds.

Between 6 and 2 kyu, Kani's settings keep adding numbers faster than they add time: 6 numbers in 9 seconds at 6 kyu, 12 in 12 at 2 kyu. The time per number falls from 1.5 seconds to 1.

1 kyu is the last kyu level and a published one: 15 numbers of 2 digits in 13 seconds, 0.867 seconds a number. Its totals run to three digits and occasionally four, so the running total has to be held across three rods while the numbers keep arriving.

How Kani builds the numbers

From 10 kyu every number has exactly two digits, from 10 to 99, and carrying is allowed wherever it falls. Kani's sittings only add at these levels. The Flash Anzan Kentei Association's pages that we checked do not say whether its kyu levels from 10 kyu up include subtraction, so addition only is Kani's reading.

The same number never flashes twice in a row, and a sitting avoids repeating a whole sequence. Because the numbers are drawn freely within their width, a question can carry on almost every number or on very few, which is closer to real flash anzan than a fixed pattern would be.

One sample sequence per level

One printed sequence per level, from the same engine and settings as the practice sitting. Add them in order, left to right, then open the total. Reading a row aloud at the level's pace is a good warm-up before a sitting.

10 kyu2 × 2-digit, 4 s
8865
Show the total
Total:153
9 kyu3 × 2-digit, 6 s
371315
Show the total
Total:65
8 kyu4 × 2-digit, 7 s
92503260
Show the total
Total:234
7 kyu5 × 2-digit, 8 s
2345291449
Show the total
Total:160
6 kyu6 × 2-digit, 9 s
113964226545
Show the total
Total:246
5 kyu7 × 2-digit, 10 s
21835478185649
Show the total
Total:359
4 kyu8 × 2-digit, 11 s
8287446695803985
Show the total
Total:578
3 kyu10 × 2-digit, 12 s
16752970109310281355
Show the total
Total:399
2 kyu12 × 2-digit, 12 s
289830637840929188609333
Show the total
Total:794
1 kyu15 × 2-digit, 13 s
129431501179906519877143603689
Show the total
Total:837

How to practise

Make the carry automatic first
Before chasing speed, sit 10 and 9 kyu until carries no longer slow you down. With only 2 or 3 numbers, a wrong answer almost always means a slipped carry, which is easy to spot in the review.
Watch the tens rod
Most errors in this tier are on the tens: a carry forgotten, or added twice. When you review a miss, check the tens digit of your answer against the total before anything else.
Move up on seven, not on ten
A pass is seven of ten. Once a level passes twice in a row, try the next; if it drops below five, go back one level for a few sittings.
Build length before speed
The counts rise faster than the times through this tier. If long sequences are the problem, sit the lower level again and count the numbers as they flash, so the length stops being a surprise.

Common questions

What changes at 10 kyu?

The numbers become two digits and carrying is allowed. The count drops to 2, because carrying is a new skill; the sequences then lengthen again level by level.

Are 6 to 2 kyu the Flash Anzan Kentei Association's figures?

No. The Flash Anzan Kentei Association's ladder has those levels, but we have not confirmed their figures from its pages, so the counts and times are Kani's practice settings, as the note under the table says.

How fast is 1 kyu?

On the Flash Anzan Kentei Association's published ladder, 15 numbers of 2 digits in 13 seconds, about 0.867 seconds a number.

Do these levels include subtraction?

Kani's practice sittings only add from 10 kyu up. The Flash Anzan Kentei Association pages we checked do not say either way.

Sources

Kani Math is not affiliated with, endorsed by or licensed by the Japan Flash Anzan Kentei Association (Nihon Flash Anzan Kentei Kyokai), the League for Soroban Education of Japan (Zenshuren), the League of Japan Abacus Associations (Nishuren) or any other exam body. The levels on these pages are a practice ladder modelled on the one that association publishes: levels the table notes name as Kani practice settings carry Kani's own values, every sequence is generated by Kani, and a practice result is not a certification. Flash Anzan is a trademark of its owner. Exam details can change, so confirm them with whoever runs your sitting.