\(\begin{array}{*{20}{c}}{a)\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{25}\\{39}\end{array}}\\\hline{\,\,\,64}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{46}\\{46}\end{array}}\\\hline{\,\,\,92}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{64}\\{26}\end{array}}\\\hline{\,\,\,90}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{75}\\{15}\end{array}}\\\hline{\,\,\,90}\end{array}\)
\(\begin{array}{*{20}{c}}{b)\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{17}\\{\,7}\end{array}}\\\hline{\,\,\,24}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{89}\\{\,\,2}\end{array}}\\\hline{\,\,\,91}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{58}\\{\,\,\,2}\end{array}}\\\hline{\,\,\,60}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{67}\\{\,\,3}\end{array}}\\\hline{\,\,\,70}\end{array}\)
