Decimal system may refer to:

• The decimal (base ten) number system, used in mathematics for writing numbers and performing arithmetic. The decimal ( base ten or occasionally denary) Numeral system has ten as its base. Mathematics is the body of Knowledge and Academic discipline that studies such concepts as Quantity, Structure, Space and
• The Dewey Decimal System, a subject classification system used in libraries. The Dewey Decimal Classification ( DDC, also called the Dewey Decimal System) is a Proprietary system of Library classification developed
• The decimal currency system, where each unit of currency can be divided into 100 sub-units. In the management of currencies, decimalisation (or decimalization) is the process of converting from traditional denominations to a " Decimal "

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