Answer
$0.00254$
Work Step by Step
Since the exponent of $10$ is $\text{
negative
}
3
,$ move the decimal point $
3
$ places to the $\text{
left.
}$ Hence, the given expression, $
2.54\times10^{-3}
$ is equivalent to
\begin{array}{l}\require{cancel}
0.00254
.\end{array}