Adding and subtracting integers

Adding and Subtracting integers.
Negative integers represents values below zero and positive numbers represent numbers above zero.
When you add a positive number over a negative number its like subtracting it.
Ex: 10+(-5)=(+5)
When you add a negative number over a positive number your decreasing it too.
Ex: (-54)+4=(-50)
When you subtract a positive number over a negative number its like addition.
Ex: 42+(-6)=48
When you subtract a negative number over a positive number its the same like addition.
Ex:(-12)-5=(-17)