Answer
$-6+(-5)=-11$
$\ \ \ \curvearrowleft\!\curvearrowleft\!\curvearrowleft\!\curvearrowleft\!\curvearrowleft$
$\overleftarrow{\ \ |\ \ |\ \ |\ \ |\ \ |\ \ |\ \ |\ \ |\ \ |\ \ |\ \ |\ \ |\ \ |\ \ }$
${\ \ \ -1\ \ \ \ \ \ \ \ -5\ \ \ \ \ \ -1 \ 0}$
${\ \ \ \ \ \ \ \ 0}$
Work Step by Step
To add -5, count 5 to the left starting at -6.