"Abacus Explained : Origins, Benefits, and Basics"

How to Use an Abacus: A Step-by-Step Guide

Lesson 1: How to Properly Use an Abacus - Counting to 20 | For Parents and Teachers

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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

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