35 * a
Если a = 10, то 35 * 10 = 350.
Если a = 12, то 35 * 12 = 420.
Если a = 15, то 35 * 15 = 525.
Если a = 20, то 35 * 20 = 700.
Вычисления:
35 * 10 = 350

840 − x
Если x = 360, то 840 − 360 = 480.
Если x = 780, то 840 − 480 = 360.
Если x = 840, то 840 − 840 = 0.
Вычисления:
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}840\\ 360\end{array}}\\ \begin{array}{r}480\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}840\\ 480\end{array}}\\ \begin{array}{r}360\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}840\\ 840\end{array}}\\ \begin{array}{r}0\end{array}\end{array}$

m + 91
Если m = 9, то 9 + 91 = 100.
Если m = 49, то 49 + 91 = 140.
Если m = 91, то 91 + 91 = 182.
Вычисления:
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}9\\ 91\end{array}}\\ \begin{array}{r}100\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}49\\ 91\end{array}}\\ \begin{array}{r}140\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}91\\ 91\end{array}}\\ \begin{array}{r}182\end{array}\end{array}$

256 : y
Если y = 2, то 256 : 2 = 128.
Если y = 4, то 256 : 4 = 64.
Если y = 64, то 256 : 64 = 4.
Если y = 128, то 256 : 128 = 2.
Вычисления
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}256\\ \phantom{0}\underset{¯}{2}\\ \phantom{0}\underset{¯}{\phantom{0}}5\\ \phantom{00}\underset{¯}{4}\\ \phantom{0}\underset{¯}{\phantom{0}}16\\ \phantom{00}\underset{¯}{16}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)2}\\ \overline{\overline{)128}}\end{array}\end{array}$
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}256\\ \phantom{0}\underset{¯}{24}\\ \phantom{0}\underset{¯}{\phantom{0}}16\\ \phantom{00}\underset{¯}{16}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)4}\\ \overline{\overline{)64}}\end{array}\end{array}$