Условие:

Вычисли устно.
7 * 6 + 1
36 : 4 − 3
8 * 7 + 10
100 − 4 * 5
624 − 32 : 8
200 + 9 * 9

7 * 6 + 1 = 43
36 : 4 − 3 = 6
8 * 7 + 10 = 66
100 − 4 * 5 = 80
624 − 32 : 8 = 620
200 + 9 * 9 = 281
Вычисления:
7 * 6 + 1 = 42 + 1 = 43
36 : 4 − 3 = 9 − 3 = 6
8 * 7 + 10 = 56 + 10 = 66
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}56\\ 10\end{array}}\\ \begin{array}{r}66\end{array}\end{array}$
100 − 4 * 5 = 100 − 20 = 80
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}100\\ 20\end{array}}\\ \begin{array}{r}80\end{array}\end{array}$
624 − 32 : 8 = 624 − 4 = 620
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}624\\ 4\end{array}}\\ \begin{array}{r}620\end{array}\end{array}$
200 + 9 * 9 = 200 + 81 = 281
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}200\\ 81\end{array}}\\ \begin{array}{r}281\end{array}\end{array}$