Multiply Each Pair of Binary Numbers $\begin{array} { r } 10101 _ { 2 } \\\times \quad 101 _ { 2 } \\\hline\end{array}$

Multiply each pair of binary numbers.
- $\begin{array} { r } 10101 _ { 2 } \\\times \quad 101 _ { 2 } \\\hline\end{array}$