$$( 8.0 \times 10^{ 4 } )(5 .0 \times 10^{ 2 } )$$
$40000000$
$$8\times 10^{6}\times 5$$
$$8\times 1000000\times 5$$
$$8000000\times 5$$
$$40000000$$
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$2^{9}\times 5^{7}$
