Abacus Lesson 1 // Introduction, Proper Technique, & History of the Abacus // Tutorial

Abacus from basics || Abacus Lesson 1 || Introduction.

Mastering the Abacus: A Beginner's Guide

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History of Abacus | What is Abacus? | Evolution of Abacus | World's First Calculating Device

The Abacus Presentation: History, Theory and Operation

"Abacus Explained : Origins, Benefits, and Basics"