Number - Decimal (base 10) notation

1 - About

Decimal is a numeral system base 10 (0,1,2,3,4,5,6,7,8,9)

3 - Representation

3.1 - Whole Number

The usual decimal representation of whole numbers gives every whole number a unique representation as a finite sequence of digits.

3.2 - Rational Number

When decimal representation is used for the rational or real numbers, such numbers in general have an infinite number of representations, for example 2.31 can also be written as 2.310, 2.3100000, 2.309999999…, etc., all of which have the same meaning except for some scientific and other contexts where greater precision is implied by a larger number of figures shown.

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