To write it out: -10 + -9 + ... + 9 + 10 = 0. It's pretty easy to just add it out or use a calculator. However, there is a simpler, more logical solution. We must realize that additive inverses add to 0. Meaning -10 + 10 = 0 - 9 + 9 = 0 And so on. Note that all numbers except the 0 will be reduced to 0. All of these 0s equal 0.
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-2, -1, 0, 1
There are one thousand. Starting at 2000 and going to 2999
Do this in reverse. The sum of -1 and -1 is -1+-1=-2 The difference of -6 and -6 is -6-(-6)=-6+6=0 0 increased by -2 is 0+-2=-2 The sum of 10 and -2 is 10+-2=8 Translation: 8
All integers more than 0, although 0 is sometimes included in the set.
positive integers