$$2 + (-12)$$
$$-17,-16,-15,-14,-13,-12,-11,-10,-9,-8,-7,-6,-5,-4,-3, -2, -1 \ ,0 \ ,1 \ ,2 \ ,3 \ ,4,\ 5,\ 6,\ 7,\ 8$$
$$-12 $$ is smaller than $$2$$.
So, we have to go $$2$$ places right from $$-12$$, which is equal to number $$-10$$
Hence,$$2 + (-12) = -10$$