Answer
$6^{3}$ $\times$ $6^{3}$ = 6$\times$6$\times$6$\times$6$\times$6$\times$6 = $6^{6}$ = $6^{3+3}$
Work Step by Step
The expression uses the exponents law for adding the exponents when the base is the same.
$6^{3}$ $\times$ $6^{3}$ = $6^{3+3}$ = $6^{6}$