2567 + 86305 = 88872
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}2567\\ 86305\end{array}}\\ \begin{array}{r}88872\end{array}\end{array}$

9231 − 574 = 8657
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}9231\\ 574\end{array}}\\ \begin{array}{r}8657\end{array}\end{array}$

5420 * 302 = 1636840
$\begin{array}{r}\times \underset{¯}{\begin{array}{r}5420\\ 302\end{array}}\\ 10840\\ 0\phantom{0}\\ 16260\phantom{00}\\ \overline{1636840}\end{array}$

3924 : 26 = 150 (ост.24)
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}3924\\ \phantom{0}\underset{¯}{26}\\ \underset{¯}{\phantom{0}}132\\ \phantom{0}\underset{¯}{130}\\ \phantom{00}\underset{¯}{\phantom{0}}24\\ \phantom{0000}\underset{¯}{0}\\ \phantom{000}24\end{array}& \begin{array}{l}\overline{)26}\\ \overline{\overline{)150}}\end{array}\end{array}$