Abacus based Mental Arithmetic In the autonomous phase of Learning any skill, the learnt skill becomes automatic by constant practice....

What Is An Abacus? Abacus (plural abaci or abacuses), is a counting frame, used as a calculating tool. It is a very ancient tool and was...

by Toshio Nakano, Honorary Professor, Daito Bunka University 1. The Historical Development Of Zhusuan (Abacus Mental Arithmetic) The...