$\begin{array}{c}8319\\ \underset{‾}{-2318}\\ 6001\end{array}\backslash def\backslash arraystretch\{1.25\}\; \backslash begin\{array\}\{l\}\backslash ;\backslash ;\backslash ;\backslash ;\backslash ;\backslash ;8\backslash ;\backslash ;3\backslash ;\backslash ;1\backslash ;\backslash ;9\backslash \backslash \backslash underline\{-\backslash ;\backslash ;\backslash ;2\backslash ;\backslash ;3\backslash ;\backslash ;1\backslash ;\backslash ;8\}\backslash \backslash \backslash ;\backslash ;\backslash ;\backslash ;\backslash ;\backslash ;6\backslash ;\backslash ;0\backslash ;\backslash ;0\backslash ;\backslash ;1\backslash end\{array\}$

$2318-8319=-60012318-8319=-6001$

Multipliziere zunächst die beiden Zahlen ohne das Vorzeichen.

$\begin{array}{c}\underset{‾}{16\cdot 5}\\ \underset{‾}{5_{3}0}\\ 80\end{array}\backslash def\backslash arraystretch\{1.25\}\; \backslash begin\{array\}\{r\}\backslash underline\{16\backslash cdot5\}\backslash \backslash \backslash underline\{\backslash \backslash 5\_30\}\backslash \backslash 80\backslash end\{array\}$

Betrachte nun die beiden Vorzeichen. Die Multplikation von zwei negativen Zahlen ergibt eine positive Zahl.

$(-)\cdot (-)=+(-)\backslash cdot(-)=+$

$=>(-16)\cdot (-5)=80=>\; (-16)\backslash cdot(-5)=80$