What number should we add to 5, to get 3?
The number that should be added to 5 to get 3 is obtained by subtracting 5 from 3.
3 − 5 = −2
So, −2 should be added to 5 to get 3.
What should we add to 5, to get −5?
What number should be add to 5, to get 0?