4 ц − 318 кг = 4 ц − 3,18 ц = 0,82 ц
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}\mathrm{4,00}\\ \mathrm{3,18}\end{array}}\\ \begin{array}{r}\mathrm{0,82 }\end{array}\end{array}$

28 ц 7 кг + 63 кг = 28,07 ц + 0,63 ц = 28,7 ц
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}\mathrm{28,07}\\ \mathrm{0,63}\end{array}}\\ \begin{array}{r}\mathrm{28,7 }\end{array}\end{array}$

3,48 т + 572 кг = 34,8 ц + 5,72 ц = 40,52 ц
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}\mathrm{34,80}\\ \mathrm{5,72}\end{array}}\\ \begin{array}{r}\mathrm{40,52 }\end{array}\end{array}$

3 т 2 ц 1 кг − 1 т 10 кг = 32,01 ц − 10,1 ц = 21,91 ц
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}\mathrm{32,01}\\ \mathrm{10,1}\end{array}}\\ \begin{array}{r}\mathrm{21,91 }\end{array}\end{array}$