To perform binary addition, we add the numbers column by column from right to left, following the rules: $0+0=0$, $0+1=1$, $1+0=1$, and $1+1=10$ (write 0, carry 1). (i) $(10111.01)_2 + (10101.01)_2$ $$ \begin{aligned} \begin{array}{r@{\quad}l} & 10111.01 \\ + & 10101.01 \\ \hline & 101100.10 \end{array} \end{aligned} $$ (ii) $(110)_2 + (1100)_2 + (11000)_2$ $$ \begin{aligned} \begin{array}{r@{\quad}l} & 00110 \\ & 01100 \\ + & 11000 \\ \hline & 101010 \end{array} \end{aligned} $$