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Abacus: Taking the first step
Abacus
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How Do You Calculate on the Abacus? | blog@CACM | Communications of the ACM
Before There Were Calculators - A Resource Guide to the Abacus
How to Use an Abacus (with Pictures) - wikiHow
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How to Use an Abacus to Teach Kids Math - WeHaveKids
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Abacus - Wikipedia
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How to Use an Abacus (with Pictures) - wikiHow
Complete Guide: How to add two numbers using Abacus?
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