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→About Abacus
File:Nepohualtzintzin.png|nepohualtzintzin (Mayan)
File:Nepohualtzintzin.png|nepohualtzintzin (Mayan)
File:Binary.png|binary (base 2)
File:Binary.png|binary (base 2)
File:Hexadecimal.png|hexadecimal (base 16)
File:Fraction.png|fractions (1/2, 1/3, 1/4,...)
File:Fraction.png|fractions (1/2, 1/3, 1/4,...)
File:Custom-abacus.png|custom, as shown: octal (base 8)
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