Question

what property is -80 + 0 = -80

Answer 1

When 0 is added to any real number,
the sum is IDENTICAL to that number.

Answer 2

We call 0 the IDENTITY ELEMENT for addition.

Answer 3

Identity Property of Addition
There is a unique real number 0
such that for every real number a,
$$a+0=a$$and $$0+a=a$$

Answer 4

Identity property of Addition

Answer 5

Please close this question if you are done

Answer 6

And give the medal to @skullpatrol