Question

what is decimal expantion

Answer 1

Decimal expansion of rational numbers : terminating decimals, non terminating repeating decimals.
Decimal expansion of irrational numbers: non terminating non repeating

Answer 2

The decimal numeral system is the standard system for denoting integer and non-integer numbers. It is the extension to non-integer numbers of the Hindu–Arabic numeral system. The way of denoting numbers in the decimal system is often referred to as decimal notation.

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