Question

How does -3-10= -13? Please explain

Answer 1

-3-10= -13
Use the keep, change, opposite method.
Keep -3, change minus to add, and the opposite of 10 is -10.
-3 + (-10) = -13
You are basically adding negatives together if you use my method.
I hope this helps :)

Answer 2

-3 is 3 less than zero. So when you also take ten away, the -3 becomes -13