\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{326}\\{253}\end{array}}\\\hline{\,\,\,\,579}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{432}\\{261}\end{array}}\\\hline{\,\,\,\,693}\end{array}\)
\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{732}\\{\,\,55}\end{array}}\\\hline{\,\,\,787}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{643}\\{\,\,\,50}\end{array}}\\\hline{\,\,\,\,693}\end{array}\)