A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. The word decimal, with the prefix deci- refers to ten.
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Dewey decimal system
The numeric value of 10 is a whole number that represents a quantity or value. In the decimal system, 10 is written as "10" and is composed of the digit 1 in the tens place and the digit 0 in the ones place. It is also the base for our numbering system, as we use a base-10 system for counting and calculations.
It varies depending on the base you are using. The standard is the decimal system (because of the 10 fingers on our hands) 0-9. Some other used systems (especially for computers) are binary 2, octal 8, hexadecimal 16 using the digits: 0-9,A-F.
Because it is a point that is used in the decimal system of counting. Decimal means based on ten.
The Decimal System.