1) 100 − 42 = 58
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}100\\ 42\end{array}}\\ \begin{array}{r}\mathrm{58 }\end{array}\end{array}$
2) 270 − 130 = 140
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}270\\ 130\end{array}}\\ \begin{array}{r}\mathrm{140 }\end{array}\end{array}$
3) 109 + 56 = 165
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}109\\ 56\end{array}}\\ \begin{array}{r}\mathrm{165 }\end{array}\end{array}$
4) 75 + 325 = 400
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}75\\ 325\end{array}}\\ \begin{array}{r}\mathrm{400 }\end{array}\end{array}$
5) 150 − 98 = 52
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}150\\ 98\end{array}}\\ \begin{array}{r}\mathrm{52 }\end{array}\end{array}$
6) 1207 + 1023 = 2230
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}1207\\ 1023\end{array}}\\ \begin{array}{r}\mathrm{2230 }\end{array}\end{array}$
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