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Numeral system
A numeral system is a mathematical notation for representing numbers of a given set.
Explanation
A numeral system is used to represent numbers. A number is represented as a sequence of numerals to defined rules.
In a positional numeral system, the base is the number of different numerals for a position. By decimal numbers you have base 10.
Example 1
On a Casio fx9860GII calculator you can select a numeral system.