tính 56 + 44

\[\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{56}\\{44}\end{array}} \\\,\,100\end{array}\]

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{70}\\{57}\end{array}} \\\,\,\,\,13\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{37}\\{63}\end{array}} \\\,\,100\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{80}\\{68}\end{array}} \\\,\,\,\,12\end{array}\)