Условие:

900 − 756 : 9 − 84;
906 : 6 * 100;
1000 − 806.

900 − 756 : 9 − 84 = 900 − 84 − 84 = 816 − 84 = 732
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}756\\ \phantom{0}\underset{¯}{72}\\ \phantom{0}\underset{¯}{\phantom{0}}36\\ \phantom{00}\underset{¯}{36}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)9}\\ \overline{\overline{)84}}\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}900\\ 84\end{array}}\\ \begin{array}{r}816\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}816\\ 84\end{array}}\\ \begin{array}{r}732\end{array}\end{array}$
 
906 : 6 * 100 = 151 * 100 = 15100
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}906\\ \phantom{0}\underset{¯}{6}\\ \underset{¯}{\phantom{0}}30\\ \phantom{0}\underset{¯}{30}\\ \phantom{00}\underset{¯}{\phantom{0}}6\\ \phantom{000}\underset{¯}{6}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)6}\\ \overline{\overline{)151}}\end{array}\end{array}$
 
1000 − 806 = 194
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}1000\\ 806\end{array}}\\ \begin{array}{r}194\end{array}\end{array}$