Number system representation

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Can anyone help with the highlighted parts of the question below?

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Part (b)(i) Note the floating point representation of the fraction: $\frac{5}{9} = .555555$.

The calculations step-by-step: $$ \begin{align} A(B^T+C^T) &= A \begin{bmatrix}0.2 \\.11\cdot 10^1 \end{bmatrix} = \begin{bmatrix}0.13 \\.221'111 \end{bmatrix} \\ AB^T &= \begin{bmatrix}0.11 \\.155'555 \end{bmatrix} \\ AC^T &= \begin{bmatrix}0.2 \cdot 10^{-1} \\.655'555 \cdot 10^{-1} \end{bmatrix} \\ \implies AB^T + AC^T &= \begin{bmatrix}0.13 \\.221'110 \end{bmatrix}\,. \end{align} $$ The floating-point operations are explained in depth at wikipedia.

Part (b)(ii) Sum positive and negative numbers separately and finally add them. Furthermore, successively add from smallest absolute value to largest.