Question

How to do adding integers

Answer 1

To put simple like this 
add as normal
2+2=4
add if were positive but keep it negative 
-2+-2=-4
at this point it basically turns in to a subtraction problem  
2+-2=0
here is another way to look at it. two positives (+) and two negatives (-)
+ +
- -
if there is a negative under it, it is canceled out.

in this there are 5 positives and 3 negatives. each negative will cancel one positive leaving +2 left
+ + + + +
-  -  -  
hope that explains it some what.