decimal number system

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Noun1.decimal number system - a positional system of numeration that uses decimal digits and a base of ten
positional notation, positional representation system - a numeration system in which a real number is represented by an ordered set of characters where the value of a character depends on its position
algorism - the Arabic (or decimal) system of numeration
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References in periodicals archive ?
Among the topics are math logic and other problem-solving strategies, the decimal number system and problems on digits, math squares and related problems, divisibility by three and remainders, and graphs and their applications.
This is a decimal number system. But why use binary numbers?