407 + 109 * 5;
903 − 206 * 4;
(700 − 603) * 6;
(800 − 704) * 7;
804 : 4;
627 : 3.

407 + 109 * 5; 903 − 206 * 4; (700 − 603) * 6; (800 − 704) * 7; 804 : 4; 627 : 3.

407 + 109 * 5 = 407 + 545 = 952

\begin{array}{r} \times \underline{\begin{array}{r} 109 \\ 5 \end{array}} \\ 545 \end{array}

\begin{array}{r} \begin{array}{r} + \end{array} \begin{array}{r} 407 \\ 545 \end{array} \\ \begin{array}{r} 952 \end{array} \end{array}

903 − 206 * 4 = 903 − 824 = 79

\begin{array}{r} \times \underline{\begin{array}{r} 206 \\ 4 \end{array}} \\ 824 \end{array}

\begin{array}{r} \begin{array}{r} - \end{array} \begin{array}{r} 903 \\ 824 \end{array} \\ \begin{array}{r} 79 \end{array} \end{array}

(700 − 603) * 6 = 97 * 6 = 582

\begin{array}{r} \begin{array}{r} - \end{array} \begin{array}{r} 700 \\ 603 \end{array} \\ \begin{array}{r} 97 \end{array} \end{array}

\begin{array}{r} \times \underline{\begin{array}{r} 97 \\ 6 \end{array}} \\ 582 \end{array}

(800 − 704) * 7 = 96 * 7 = 672

\begin{array}{r} \begin{array}{r} - \end{array} \begin{array}{r} 800 \\ 704 \end{array} \\ \begin{array}{r} 96 \end{array} \end{array}

\begin{array}{r} \times \underline{\begin{array}{r} 96 \\ 7 \end{array}} \\ 672 \end{array}

804 : 4 = 201

\begin{matrix} \begin{array}{l} \underline{} 804 \\ \underline{8} \\ \underline{} 0 \\ \underline{0} \\ \underline{} 4 \\ \underline{4} \\ 0 \end{array} & \begin{array}{l} 4 \\ \bar{201} \end{array} \end{matrix}

627 : 3 = 209

\begin{matrix} \begin{array}{l} \underline{} 627 \\ \underline{6} \\ \underline{} 2 \\ \underline{0} \\ \underline{} 27 \\ \underline{27} \\ 0 \end{array} & \begin{array}{l} 3 \\ \bar{209} \end{array} \end{matrix}