854 − 36 : x
Если x = 1, то 854 − 36 : 1 = 854 − 36 = 818
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}854\\ 36\end{array}}\\ \begin{array}{r}818\end{array}\end{array}$
Если x = 6, то 854 − 36 : 6 = 854 − 6 = 848
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}854\\ 6\end{array}}\\ \begin{array}{r}848\end{array}\end{array}$
Если x = 9, то 854 − 36 : 9 = 854 − 4 = 850
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}854\\ 4\end{array}}\\ \begin{array}{r}850\end{array}\end{array}$
(a − 359) * 4
Если a = 360, то (360 − 359) * 4 = 1 * 4 = 4
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}360\\ 359\end{array}}\\ \begin{array}{r}1\end{array}\end{array}$
Если a = 489, то (489 − 359) * 4 = 130 * 4 = 520
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}489\\ 359\end{array}}\\ \begin{array}{r}130\end{array}\end{array}$

Если a = 506, то (506 − 359) * 4 = 147 * 4 = 588
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}506\\ 359\end{array}}\\ \begin{array}{r}147\end{array}\end{array}$