Indian Abacus - Digital is used for coaching young children of the age group 4 – 13 years for doing Abacus Mental Arithmetic calculations...

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 calc...

According to an analysis on the development of nervous tissues, the development and growth of the nervous system begins from 4 to 6 years...

By Professor Yuan Yue Min, University of Shandong, China Based on the researches conducted on the practice of the Mental Arithmetic, it h...