202 + 20 = 222
6 + 300 = 306
80 + 400 = 480
Вычисления:
202 + 20 = 222
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}202\\ 20\end{array}}\\ \begin{array}{r}222\end{array}\end{array}$
6 + 300 = 306
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}6\\ 300\end{array}}\\ \begin{array}{r}306\end{array}\end{array}$
80 + 400 = 480
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}80\\ 400\end{array}}\\ \begin{array}{r}480\end{array}\end{array}$