Вариант 1
725 − 627 = 98
18 + 482 = 500
Вариант 2
580 − 504 = 76
183 + 117 = 300
Вычисления:
_ − 627 = 98
98 + 627 = 725
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}98\\ 627\end{array}}\\ \begin{array}{r}725\end{array}\end{array}$
_ + 482 = 500
500 − 482 = 18
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}500\\ 482\end{array}}\\ \begin{array}{r}18\end{array}\end{array}$
_ − 504 = 76
76 + 504 = 580
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}76\\ 504\end{array}}\\ \begin{array}{r}580\end{array}\end{array}$
_ + 117 = 300
300 − 117 = 183
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}300\\ 117\end{array}}\\ \begin{array}{r}183\end{array}\end{array}$