Weisstein, Eric W.
The Wayback Machine - https://web.archive.org/web/20190916035708/http://mathworld.wolfram.com:80/ExpandedNotation.html
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Expanded notation is the term given in elementary mathematics education for the expansion of a positive integer in the form ,
i.e., as a sum of appropriate powers of 10 (the base of
the expansion) times its digits (in the case of base-10, decimal
digits). For example, the number with decimal expansion
1234 would be written in expanded form as
Negative are also allowed in expanded notation
of arbitrary (not necessarily integer) numbers, e.g.,
but such expansions usually not considered or deferred in elementary education contexts.
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