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

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

How To Use An Abacus-Full Tutorial

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ABACUS Combined formulas

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

The Abacus Presentation: History, Theory and Operation

History & Evolution of Abacus - Mesopotamian - Egyptian - Greek - Roman - Inca - Chinese - Japanese