42 * 20 = 840
19 * 50 = 950
418 : 2 = 209
125 : 5 = 25
612 : 6 = 102
700 : 5 = 140
518 − 9 = 509
413 − 6 = 407
Вычисления:


$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}418\\ \phantom{0}\underset{¯}{4}\\ \phantom{0}\underset{¯}{\phantom{0}}1\\ \phantom{00}\underset{¯}{0}\\ \phantom{0}\underset{¯}{\phantom{0}}18\\ \phantom{00}\underset{¯}{18}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)2}\\ \overline{\overline{)209}}\end{array}\end{array}$
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}125\\ \phantom{0}\underset{¯}{10}\\ \phantom{0}\underset{¯}{\phantom{0}}25\\ \phantom{00}\underset{¯}{25}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)5}\\ \overline{\overline{)25}}\end{array}\end{array}$
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}612\\ \phantom{0}\underset{¯}{6}\\ \phantom{0}\underset{¯}{\phantom{0}}1\\ \phantom{00}\underset{¯}{0}\\ \phantom{0}\underset{¯}{\phantom{0}}12\\ \phantom{00}\underset{¯}{12}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)6}\\ \overline{\overline{)102}}\end{array}\end{array}$
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}700\\ \phantom{0}\underset{¯}{5}\\ \underset{¯}{\phantom{0}}20\\ \phantom{0}\underset{¯}{20}\\ \phantom{00}\underset{¯}{\phantom{0}}0\\ \phantom{000}\underset{¯}{0}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)5}\\ \overline{\overline{)140}}\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}518\\ 9\end{array}}\\ \begin{array}{r}509\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}413\\ 6\end{array}}\\ \begin{array}{r}407\end{array}\end{array}$