Question

Solve: 64 $\times$ 42 =_____.

• A. 2604
• B. 2866
• C. 2688
• D. 2648

Answer 1

The correct option is C 2688

$\begin{array}{cccccc}& & & 6& 4& \\ & \times & & 4& 2& \\ & & 1& 2& 8& (64\times 2)\\ +& 2& 5& 6& & (64\times 4)\\ & 2& 6& 8& 8& \end{array}$