76 − 18 : 3 = 70
Вычисления:
76 − 18 : 3 = 76 − 6 = 70
1) 18 : 3 = 6
2) 76 − 6 = 70

(20 + 16) : (82 − 76) = 6
Вычисления:
(20 + 16) : (82 − 76) = 36 : 6 = 6
1) $\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}20\\ 16\end{array}}\\ \begin{array}{r}36\end{array}\end{array}$
2) $\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}82\\ 76\end{array}}\\ \begin{array}{r}6\end{array}\end{array}$
3) 36 : 6 = 6

6 * 4 − 2 * 8 = 8
Вычисления:
6 * 4 − 2 * 8 = 24 − 16 = 8
1) 6 * 4 = 24
2) 2 * 8 = 16
3) $\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}24\\ 16\end{array}}\\ \begin{array}{r}8\end{array}\end{array}$