please help right the rules for adding and subtracting

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The rules of adding and substracting are pretty simple but may be confussing at times.

-Adding has no problem especialy when dealing with positive inteers. e.g 45+3=48

-Adding negative integers is equivalent to taking the positive integer and subtracting from it the negative integer.

e,g 10+(-9) is the same as 10-9=1

-Adding negative integers is the same as adding the two numbers as you would if they were positive then placing a negative sign in fron if the result.

e.g -9+(-9)=-18

-Subtracting negative integers is different in that -9-(-9)=?

the two negative signs change to a plus hence we have -9+9

which is equal to zero.

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