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

How To Use An Abacus-Full Tutorial

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

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

"Quick Guide: What is Abacus & How to Use It?" #education

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

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