m = 719
234 + m + 328 = (234 + 328) + m = 562 + m = 562 + 719 = 1281

Вычисления:
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}234\\ 328\end{array}}\\ \begin{array}{r}\mathrm{562 }\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}562\\ 719\end{array}}\\ \begin{array}{r}\mathrm{1281 }\end{array}\end{array}$

n = 128
764 − 457 − n = (764 − 457) − n = 307 − n = 307 − 128 = 179

Вычисления:
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}764\\ 457\end{array}}\\ \begin{array}{r}\mathrm{307 }\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}307\\ 128\end{array}}\\ \begin{array}{r}\mathrm{179 }\end{array}\end{array}$