\( \begin{array}{r} 536 \\ + 248 \\ \hline 784 \end{array} \)
\( \begin{array}{r} 219 \\ + 624 \\ \hline 843 \end{array} \)
\( \begin{array}{r} 586 \\ + 273 \\ \hline 859 \end{array} \)
\( \begin{array}{r} 835 \\ - 237 \\ \hline 598 \end{array} \)
\( \begin{array}{r} 674 \\ - 567 \\ \hline 107 \end{array} \)
\( \begin{array}{r} 349 \\ - 168 \\ \hline 181 \end{array} \)