Editing 0 (section)

=== As a digit ===
{{main|Positional notation}}

In positional number systems (such as the usual [[decimal notation]] for representing numbers), the digit 0 plays the role of a placeholder, indicating that certain powers of the base do not contribute. For example, the decimal number 205 is the sum of two hundreds and five ones, with the 0 digit indicating that no tens are added. The digit plays the same role in [[decimal fractions]] and in the [[decimal representation]] of other real numbers (indicating whether any tenths, hundredths, thousandths, etc., are present) and in bases other than 10 (for example, in binary, where it indicates which powers of 2 are omitted).{{sfn|Reimer|2014|pp=156,199–204}}