Сумма чисел:
400 + 80 + 5 = 485
8 + 50 + 100 = 158
111 + 222 + 333 = 666
200 + 30 + 6 = 236
Разность чисел:
999 − 90 = 909
367 − 300 = 67
876 − 252 = 624
648 − 40 = 608
Вычисления:
400 + 80 + 5 = 480 + 5 = 485
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}400\\ 80\end{array}}\\ \begin{array}{r}480\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}480\\ 5\end{array}}\\ \begin{array}{r}485\end{array}\end{array}$
8 + 50 + 100 = 58 + 100 = 158
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}8\\ 50\end{array}}\\ \begin{array}{r}58\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}58\\ 100\end{array}}\\ \begin{array}{r}158\end{array}\end{array}$
111 + 222 + 333 = 333 + 333 = 666
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}111\\ 222\end{array}}\\ \begin{array}{r}333\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}333\\ 333\end{array}}\\ \begin{array}{r}666\end{array}\end{array}$
200 + 30 + 6 = 230 + 6 = 236
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}200\\ 30\end{array}}\\ \begin{array}{r}230\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}230\\ 6\end{array}}\\ \begin{array}{r}236\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}999\\ 90\end{array}}\\ \begin{array}{r}909\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}367\\ 300\end{array}}\\ \begin{array}{r}67\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}876\\ 252\end{array}}\\ \begin{array}{r}624\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}648\\ 40\end{array}}\\ \begin{array}{r}608\end{array}\end{array}$