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Abacus - Wikipedia
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How to Use an Abacus (with Pictures) - wikiHow | Abacus, Abacus math, New things to learn
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Abakus - Wikipedia
This portable 1st abacus would have been particularly useful for Roman engineers, merchants, and tax collectors. Columns can calculate fractions and single units on the right side, all the way up to
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Sidux/Useable applications/Calculators - Wikibooks, open books for an open world
How to Use an Abacus (with Pictures) - wikiHow
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Roman abacus - Wikipedia
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