If it is two negative numbers then you add:
ex: -7 + -5 = -12
If it is two different signs, then you subtract:
ex: -8 + 2 = -6
Can you see which one is the larger absolute value? 8 is larger than 2 so it is negative.
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Subtract the number with the smaller absolute value from the other. Give the answer the sign of the number with the larger absolute value.
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".
They have to have a common denominator
Sn = n*(n+1)
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