227050 − (357 + 2406) : 3 = 27050 − 2763 : 3 = 27050 − 921 = 26129
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}357\\ 2406\end{array}}\\ \begin{array}{r}2763\end{array}\end{array}$
 
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}2763\\ \phantom{0}\underset{¯}{27}\\ \phantom{00}\underset{¯}{\phantom{0}}6\\ \phantom{000}\underset{¯}{6}\\ \phantom{000}\underset{¯}{\phantom{0}}3\\ \phantom{0000}\underset{¯}{3}\\ \phantom{0000}0\end{array}& \begin{array}{l}\overline{)3}\\ \overline{\overline{)921}}\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}227050\\ 921\end{array}}\\ \begin{array}{r}26129\end{array}\end{array}$
 
90000 − (80010 − 2604) : 2 = 90000 − 77406 : 2 = 90000 − 38703 = 51297
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}80010\\ 2604\end{array}}\\ \begin{array}{r}77406\end{array}\end{array}$
 
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}77406\\ \phantom{0}\underset{¯}{6}\\ \underset{¯}{\phantom{0}}17\\ \phantom{0}\underset{¯}{16}\\ \phantom{0}\underset{¯}{\phantom{0}}14\\ \phantom{00}\underset{¯}{14}\\ \phantom{000}\underset{¯}{\phantom{0}}0\\ \phantom{0000}\underset{¯}{0}\\ \phantom{0000}\underset{¯}{\phantom{0}}6\\ \phantom{00000}\underset{¯}{6}\\ \phantom{00000}0\end{array}& \begin{array}{l}\overline{)2}\\ \overline{\overline{)38703}}\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}90000\\ 38703\end{array}}\\ \begin{array}{r}51297\end{array}\end{array}$
 
(730 + 100 + 270) : 10 = ((730 + 270) + 100) : 10 = (1000 + 100) : 10 = 1100 : 10 = 110
 
(940 + 60) * 1000 = 1000 * 1000 = 1000000