How Do You Calculate on the Abacus? | blog@CACM | Communications of the ACM
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How Does an Abacus Work? (Tutorial on Abacus) - YouTube
How to Calculate Using an Abacus
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How to Use an Abacus (with Pictures) - wikiHow
How to Use an Abacus (with Pictures) - wikiHow
What is an abacus? The history of abacus calculating device. | Kурсове по английски, БЕЛ, математика и ментална аритметика
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Abacus Tutorial: 2 The "exchange method" - calculating up to 5 - YouTube
