80 : 40 = 2
600 : 30 = 20
84 : 4 = 21
123 : 3 = 41
140 : 70 = 2
480 : 6 = 80
810 : 9 = 90
810 : 90 = 9
Вычисления:

$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}600\\ \phantom{0}\underset{¯}{60}\\ \phantom{00}\underset{¯}{\phantom{0}}0\\ \phantom{000}\underset{¯}{0}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)30}\\ \overline{\overline{)20}}\end{array}\end{array}$
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}84\\ \phantom{0}\underset{¯}{8}\\ \phantom{0}\underset{¯}{\phantom{0}}4\\ \phantom{00}\underset{¯}{4}\\ \phantom{00}0\end{array}& \begin{array}{l}\overline{)4}\\ \overline{\overline{)21}}\end{array}\end{array}$
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}123\\ \phantom{0}\underset{¯}{12}\\ \phantom{00}\underset{¯}{\phantom{0}}3\\ \phantom{000}\underset{¯}{3}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)3}\\ \overline{\overline{)41}}\end{array}\end{array}$

$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}480\\ \phantom{0}\underset{¯}{48}\\ \phantom{00}\underset{¯}{\phantom{0}}0\\ \phantom{000}\underset{¯}{0}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)6}\\ \overline{\overline{)80}}\end{array}\end{array}$
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}810\\ \phantom{0}\underset{¯}{81}\\ \phantom{00}\underset{¯}{\phantom{0}}0\\ \phantom{000}\underset{¯}{0}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)9}\\ \overline{\overline{)90}}\end{array}\end{array}$