Answer:
-108
Explanation:
Well, if the equation shown is:
-100 - 8 = ?
Then it's -108.
When subtracting from a negitive number, I like to imagine I'm just adding two positive numbers then sticking a sign in front of it. Like this:
100 + 8 = 108 -> -108
Obviously, this won't work all the time, but maybe it can help with small problems like the one you have.