900 − 2 * 50 + 140 = 900 − 100 + 140 = 800 + 140 = 940;
600 + 90 : 3 − 200 = 600 + 30 − 200 = 630 − 200 = 430;
700 − 25 * 2 + 100 = 700 − 50 + 100 = 650 + 100 = 750;
120 − 75 : 3 * 4 + 65 = 120 − 25 * 4 + 65 = 120 − 100 + 65 = 20 + 65 = 85;
200 − 80 : 4 * 5 − 35 = 200 − 20 * 5 − 35 = 200 − 100 − 35 = 100 − 35 = 65;
108 − 54 : 9 * 6 + 58 = 108 − 6 * 6 + 58 = 108 − 36 + 58 = 72 + 58 = 130;
342 : 3 = 114;
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}342\\ \phantom{0}\underset{¯}{3}\\ \phantom{0}\underset{¯}{\phantom{0}}4\\ \phantom{00}\underset{¯}{3}\\ \phantom{0}\underset{¯}{\phantom{0}}12\\ \phantom{00}\underset{¯}{12}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)3}\\ \overline{\overline{)114}}\end{array}\end{array}$
564 : 2 = 282;
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}564\\ \phantom{0}\underset{¯}{4}\\ \underset{¯}{\phantom{0}}16\\ \phantom{0}\underset{¯}{16}\\ \phantom{00}\underset{¯}{\phantom{0}}4\\ \phantom{000}\underset{¯}{4}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)2}\\ \overline{\overline{)282}}\end{array}\end{array}$
721 : 7 = 103.
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}721\\ \phantom{0}\underset{¯}{7}\\ \phantom{0}\underset{¯}{\phantom{0}}2\\ \phantom{00}\underset{¯}{0}\\ \phantom{0}\underset{¯}{\phantom{0}}21\\ \phantom{00}\underset{¯}{21}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)7}\\ \overline{\overline{)103}}\end{array}\end{array}$