4,5 + 16,691 = 21,191
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}\mathrm{4,500}\\ \mathrm{16,691}\end{array}}\\ \begin{array}{r}\mathrm{21,191 }\end{array}\end{array}$

7,54 + 3,4 = 10,94
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}\mathrm{7,54}\\ \mathrm{3,40}\end{array}}\\ \begin{array}{r}\mathrm{10,94 }\end{array}\end{array}$

18,35 + 38,016 = 56,366
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}\mathrm{18,350}\\ \mathrm{38,016}\end{array}}\\ \begin{array}{r}\mathrm{56,366 }\end{array}\end{array}$

86,58 + 5,825 = 92,405
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}\mathrm{86,580}\\ \mathrm{5,825}\end{array}}\\ \begin{array}{r}\mathrm{92,405 }\end{array}\end{array}$

83,24 + 42,76 = 126
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}\mathrm{83,24}\\ \mathrm{42,76}\end{array}}\\ \begin{array}{r}\mathrm{126,00 }\end{array}\end{array}$

14,02 − 10,739 = 3,281
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}\mathrm{14,020}\\ \mathrm{10,739}\end{array}}\\ \begin{array}{r}\mathrm{3,281 }\end{array}\end{array}$

7,004 − 5,3245 = 1,6795
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}\mathrm{7,0040}\\ \mathrm{5,3245}\end{array}}\\ \begin{array}{r}\mathrm{1,6795 }\end{array}\end{array}$

12,5 − 8,005 = 4,495
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}\mathrm{12,500}\\ \mathrm{8,005}\end{array}}\\ \begin{array}{r}\mathrm{4,495 }\end{array}\end{array}$

262,5 − 41,54 = 220,96
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}\mathrm{262,50}\\ \mathrm{41,54}\end{array}}\\ \begin{array}{r}\mathrm{220,96 }\end{array}\end{array}$

16 − 0,568 = 15,432
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}\mathrm{16,000}\\ \mathrm{0,568}\end{array}}\\ \begin{array}{r}\mathrm{15,432 }\end{array}\end{array}$