72180 : 9 = 90000 − 81980
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}72180\\ \phantom{0}\underset{¯}{72}\\ \phantom{00}\underset{¯}{\phantom{0}}1\\ \phantom{000}\underset{¯}{0}\\ \phantom{00}\underset{¯}{\phantom{0}}18\\ \phantom{000}\underset{¯}{18}\\ \phantom{0000}\underset{¯}{\phantom{0}}0\\ \phantom{00000}\underset{¯}{0}\\ \phantom{00000}0\end{array}& \begin{array}{l}\overline{)9}\\ \overline{\overline{)8020}}\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}90000\\ 81980\end{array}}\\ \begin{array}{r}8020\end{array}\end{array}$
8020 = 8020 − равенство верно.

4070 * 8 < 18396 + 14174
$\begin{array}{r}\times \underset{¯}{\begin{array}{r}4070\\ 8\end{array}}\\ 32560\end{array}$
 
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}18396\\ 14174\end{array}}\\ \begin{array}{r}32570\end{array}\end{array}$
32560 < 32570 − неравенство верно.