The set of integers is closed under addition.Addition is commutative and associative.
There exists a unique number, 0, such that n + 0 = 0 + n for any integer n.
For every integer m, there exists an integer m' such that m + m' = m' + m = 0. m' is denoted by "-m".
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Integers include 0, the negative numbers without fractional parts, and the positive numbers without fractional parts. The "without fractional parts" part of the description implies that all of the integers are whole numbers. Therefore, if you are adding integers, you are adding whole numbers.
Subtract the number with the smaller absolute value from the other. Give the answer the sign of the number with the larger absolute value.
When you add two negative integers, the answer is still negative.
David Missoula's
-4 + -4 = -8