$ \text{Gegeben:}\\\text{Breite} \qquad b \qquad [m] \\ \text{Länge} \qquad a \qquad [m] \\ \\ \text{Gesucht:} \\\text{Fläche} \qquad A \qquad [m^{2}] \\ \\ A = a\cdot b\\ \textbf{Gegeben:} \\ b=-1m \qquad a=3\frac{1}{5}m \qquad \\ \\ \textbf{Rechnung:} \\ A = a\cdot b \\ b=-1m\\ a=3\frac{1}{5}m\\ A = 3\frac{1}{5}m\cdot -1m\\\\A=-3\frac{1}{5}m^{2} \\\\\\ \small \begin{array}{|l|} \hline b=\\ \hline -1 m \\ \hline -10 dm \\ \hline -100 cm \\ \hline -10^{3} mm \\ \hline -10^{6} \mu m \\ \hline \end{array} \small \begin{array}{|l|} \hline a=\\ \hline 3\frac{1}{5} m \\ \hline 32 dm \\ \hline 320 cm \\ \hline 3,2\cdot 10^{3} mm \\ \hline 3,2\cdot 10^{6} \mu m \\ \hline \end{array} \small \begin{array}{|l|} \hline A=\\ \hline -3\frac{1}{5} m^2 \\ \hline -320 dm^2 \\ \hline -3,2\cdot 10^{4} cm^2 \\ \hline -3,2\cdot 10^{6} mm^2 \\ \hline -\frac{4}{125} a \\ \hline -0,00032 ha \\ \hline \end{array}$