Solve: 64 $\times$ 42 =_____
2688

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Solution

The correct option is A 2688
$\begin{matrix} 6 & 4 \times & 4 & 2 1 & 2 & 8 & (64 \times 2) + & 2 & 5 & 6 & 0 & (64 \times 4) 2 & 6 & 8 & 8 \end{matrix}$

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