In Japanese language, the abacus is called soroban. In this tutorial, we are going to learn how to use the soroban. In Japan, students learn to use abacus formally in the third grade.
Believe it or not, in these modern time, some tellers in Japan still use abacus. And when they calculate, they are almost as fast as when using a calculator. Or maybe even faster.
Shown above is a drawing representing a Japanese abacus. » Read more