10 км 875 м + 925 м = 11 км 800 м
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}10875\\ 925\end{array}}\\ \begin{array}{r}11800\end{array}\end{array}$
 
12 т 015 кг − 98 кг = 11 т 917 кг
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}12015\\ 98\end{array}}\\ \begin{array}{r}11917\end{array}\end{array}$
 
15 ${м}^2$ 25 $д{м}^2$ − 50 $д{м}^2$ = 14 ${м}^2$ 75 $д{м}^2$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}1525\\ 50\end{array}}\\ \begin{array}{r}1475\end{array}\end{array}$
 
20 $д{м}^2$ 30 $с{м}^2$ + 80 $с{м}^2$ = 21 $д{м}^2$ 10 $с{м}^2$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}2030\\ 80\end{array}}\\ \begin{array}{r}2110\end{array}\end{array}$
 
17 м 30 см * 6 = 103 м 80 см
$\begin{array}{r}\times \underset{¯}{\begin{array}{r}1730\\ 6\end{array}}\\ 10380\end{array}$
 
25 ц 80 кг : 3 = 8 ц 60 кг
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}2580\\ \phantom{0}\underset{¯}{24}\\ \phantom{0}\underset{¯}{\phantom{0}}18\\ \phantom{00}\underset{¯}{18}\\ \phantom{000}\underset{¯}{\phantom{0}}0\\ \phantom{0000}\underset{¯}{0}\\ \phantom{0000}0\end{array}& \begin{array}{l}\overline{)3}\\ \overline{\overline{)860}}\end{array}\end{array}$
 
38 см 5 мм + 8 мм = 39 см 3 мм
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}385\\ 8\end{array}}\\ \begin{array}{r}393\end{array}\end{array}$
 
5 ${м}^2$ 60 $д{м}^2$ + 40 $д{м}^2$ = 6 ${м}^2$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}560\\ 40\end{array}}\\ \begin{array}{r}600\end{array}\end{array}$