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

How To Use An Abacus-Full Tutorial

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Abacus Mental Math Demonstration - Strengthen Math Facts, Improve Focus, Concentration & Memory

Abacus Tutorials | Lesson - Formula In Abacus Combination | Abacus Classes

Addition and Subtraction using Big Friends on Abacus | InstAbacus