109 * 6;
134 * 7;
959 : 7;
856 : 4;
603 − 427;
506 − 139;
(30 + 160 : 4) : 2;
280 − 40 : 2 + 100.

109 * 6; 134 * 7; 959 : 7; 856 : 4; 603 − 427; 506 − 139; (30 + 160 : 4) : 2; 280 − 40 : 2 + 100.

\begin{array}{r} \times \underline{\begin{array}{r} 109 \\ 6 \end{array}} \\ 654 \end{array}

\begin{array}{r} \times \underline{\begin{array}{r} 134 \\ 7 \end{array}} \\ 938 \end{array}

\begin{matrix} \begin{array}{l} \underline{} 959 \\ \underline{7} \\ \underline{} 25 \\ \underline{21} \\ \underline{} 49 \\ \underline{49} \\ 0 \end{array} & \begin{array}{l} 7 \\ \bar{137} \end{array} \end{matrix}

\begin{matrix} \begin{array}{l} \underline{} 856 \\ \underline{8} \\ \underline{} 5 \\ \underline{4} \\ \underline{} 16 \\ \underline{16} \\ 0 \end{array} & \begin{array}{l} 4 \\ \bar{214} \end{array} \end{matrix}

\begin{array}{r} \begin{array}{r} - \end{array} \begin{array}{r} 603 \\ 427 \end{array} \\ \begin{array}{r} 176 \end{array} \end{array}

\begin{array}{r} \begin{array}{r} - \end{array} \begin{array}{r} 506 \\ 139 \end{array} \\ \begin{array}{r} 367 \end{array} \end{array}

(30 \overset{2}{+} 160 \overset{1}{:} 4) \overset{1}{3} 2 = (30 + 40) : 2 = 70 : 2 = 35

280 \overset{2}{-} 40 \overset{1}{:} 2 \overset{3}{+} 100 = 280 - 20 + 100 = 260 + 100 = 360