Traditional division (帰除法)

You may think that the traditional and modern divisions are very different, but in fact, if you are already an expert with modern division, you are also an expert with traditional division. What happens is that nobody has told you yet ...

This article tries to be about WHY to use traditional division

How to start with the traditional division method and not die trying. You can use it in 1: 4, 2: 5, 1: 5, etc. as you can choose to use the modern division arrangement or the traditional one.

This article tries to be about HOW to use traditional division

To memorize or not to memorize, that is the question. Some patterns that appear in the division table can help you to memorize it.

In project

In the case of a 2/5 or 3/5 abacus we can use the additional upper beads (including the suspended one) to represent values from 10 to 20 that appear when using some traditional techniques, specially division, but, What can be done on an 1/5 or 1/4 abacus?

Tables for multi-digit divisors. Useful if you have lots of divisions to do with a common divisor. It will be used in Tide abacus and Julian day articles.

Both short and long divisions developed in detail using 2:5 text diagrams done with this python 3 module txt-abacus by myself.

You can also try Soroban Trainer forked from Masaaki Murakami and load the file kijoho100.sbk following the instructions on his page. In 2:5 mode use Shift+Click to set/unset the suspended bead( or use the on-screen [ShiftLock] button).