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

Abacus Rules for Beginners

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

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

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

The Abacus Presentation: History, Theory and Operation