$$\left. \begin{array} { l } { 4.31 } \\ { \times 2.51 } \\ { \times 2.51 } \end{array} \right.$$
$27.153431$
$$10.8181\times 2.51$$
$$27.153431$$
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$\frac{431 \cdot 251 ^ {2}}{2 ^ {6} \cdot 5 ^ {6}} = 27\frac{153431}{1000000} = 27.153431$