\( \begin{array}{r} 671 \\ + 229 \\ \hline 890 \end{array} \)
\( \begin{array}{r} 850 \\ - 436 \\ \hline 414 \end{array} \)
\( \begin{array}{r} 529 \\ + 367 \\ \hline 896 \end{array} \)
\( \begin{array}{r} 900 \\ - 748 \\ \hline 152 \end{array} \)