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.
