Small balls are passed through the shaft.
To the calculation by moving the ball.
Soroban has been used since about 500 years ago in Japan.
At that time,mainly of education were reading,writing,and Soroban.
Until recently,for clerical person such as a bank, the skills of Soroban was necessary.
Now, personal computer and calculator are popular.
But even today,in Japanese education, skills to use the Soroban is important.
Many children are go to private Soroban school.
If with skills of Soroban above a certain level,you can be Advanced Calculations without using the Soroban.
Because there is an image of the Soroban in the head.
