\begin{questions}
\item $\base{101010101}{2}=1\times2^8+1\times2^6+1\times2^4+1\times2^2+1\times2^0=341$.
\item $\base{111000}{2}=1\times2^5+1\times2^4+1\times2^3=56$.
\item $\base{00110011}{2}=2^5+2^4+2^1+2^0=51$.
\item $\base{1010010001}{2}=2^9+2^7+2^4+2^0=657$.
\end{questions}
