18 : 6 : 3 = 1
(15 + 5) : 4 = 5
300 + 400 = 700
300 + 40 = 340
300 − 200 = 100
3 * 3 * 9 = 81
520 + 4 = 524
738 − 30 = 708
254 − 54 = 200
109 − 100​​​​​​​ = 9
600 − 200​​​​​​​ = 400
900 − 1 = 899
Вычисления:
18 : 6 : 3 = 3 : 3 = 1
(15 + 5) : 4 = 20 : 4 = 5
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}300\\ 400\end{array}}\\ \begin{array}{r}700\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}300\\ 40\end{array}}\\ \begin{array}{r}340\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}300\\ 200\end{array}}\\ \begin{array}{r}100\end{array}\end{array}$
3 * 3 * 9 = 9 * 9 = 81
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}520\\ 4\end{array}}\\ \begin{array}{r}524\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}738\\ 30\end{array}}\\ \begin{array}{r}708\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}254\\ 54\end{array}}\\ \begin{array}{r}200\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}109\\ 100\end{array}}\\ \begin{array}{r}9\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}600\\ 200\end{array}}\\ \begin{array}{r}400\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}900\\ 1\end{array}}\\ \begin{array}{r}899\end{array}\end{array}$