197 * 5 = 985
$\begin{array}{r}\times \underset{¯}{\begin{array}{r}197\\ 5\end{array}}\\ 985\end{array}$
 
216 * 4 = 864
$\begin{array}{r}\times \underset{¯}{\begin{array}{r}216\\ 4\end{array}}\\ 864\end{array}$
 
307 * 3 − 704 : 8 = 921 − 88 = 833
$\begin{array}{r}\times \underset{¯}{\begin{array}{r}307\\ 3\end{array}}\\ 921\end{array}$
 
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}704\\ \phantom{0}\underset{¯}{64}\\ \phantom{0}\underset{¯}{\phantom{0}}64\\ \phantom{00}\underset{¯}{64}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)8}\\ \overline{\overline{)88}}\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}921\\ 88\end{array}}\\ \begin{array}{r}833\end{array}\end{array}$
 
65 * 8 − 535 : 5 = 520 − 107 = 413
$\begin{array}{r}\times \underset{¯}{\begin{array}{r}65\\ 8\end{array}}\\ 520\end{array}$
 
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}535\\ \phantom{0}\underset{¯}{5}\\ \phantom{0}\underset{¯}{\phantom{0}}3\\ \phantom{00}\underset{¯}{0}\\ \phantom{0}\underset{¯}{\phantom{0}}35\\ \phantom{00}\underset{¯}{35}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)5}\\ \overline{\overline{)107}}\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}520\\ 107\end{array}}\\ \begin{array}{r}413\end{array}\end{array}$
 
684 : 9 + (506 − 102 * 3) = 76 + (506 − 306) = 76 + 200 = 276
$\begin{array}{r}\times \underset{¯}{\begin{array}{r}102\\ 3\end{array}}\\ 306\end{array}$
 
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}506\\ 306\end{array}}\\ \begin{array}{r}200\end{array}\end{array}$
 
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}684\\ \phantom{0}\underset{¯}{63}\\ \phantom{0}\underset{¯}{\phantom{0}}54\\ \phantom{00}\underset{¯}{54}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)9}\\ \overline{\overline{)76}}\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}200\\ 76\end{array}}\\ \begin{array}{r}276\end{array}\end{array}$
 
736 : 4 + (607 − 428 : 4) = 184 + (607 − 107) = 184 + 500 = 684.
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}428\\ \phantom{0}\underset{¯}{4}\\ \phantom{0}\underset{¯}{\phantom{0}}2\\ \phantom{00}\underset{¯}{0}\\ \phantom{0}\underset{¯}{\phantom{0}}28\\ \phantom{00}\underset{¯}{28}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)4}\\ \overline{\overline{)107}}\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}607\\ 107\end{array}}\\ \begin{array}{r}500\end{array}\end{array}$
 
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}736\\ \phantom{0}\underset{¯}{4}\\ \underset{¯}{\phantom{0}}33\\ \phantom{0}\underset{¯}{32}\\ \phantom{0}\underset{¯}{\phantom{0}}16\\ \phantom{00}\underset{¯}{16}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)4}\\ \overline{\overline{)184}}\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}184\\ 500\end{array}}\\ \begin{array}{r}684\end{array}\end{array}$