426 + 289 = 715
Вычисления:
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}426\\ 289\end{array}}\\ \begin{array}{r}715\end{array}\end{array}$

384 + (384 − 95) = 384 + 289 = 673
Вычисления:
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}384\\ 95\end{array}}\\ \begin{array}{r}289\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}384\\ 289\end{array}}\\ \begin{array}{r}673\end{array}\end{array}$

704 − 569 = 135
Вычисления:
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}704\\ 569\end{array}}\\ \begin{array}{r}135\end{array}\end{array}$