$$63\times6\frac{2}{7}=$$
$396$
$$63\times \frac{42+2}{7}$$
$$63\times \frac{44}{7}$$
$$\frac{63\times 44}{7}$$
$$\frac{2772}{7}$$
$$396$$
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$2^{2}\times 3^{2}\times 11$
