The question is unclear. If it's "why does a number added to its opposite give zero?"
Generally, for any non-zero n,
"adding the complement gives a zero result"
i.e., for any n not zero, n -n = 0.
You might think of old-fashioned pharmacist's scales - if the weights in both pans are identical, the pointer sits right in the middle of the scale.
When a number is added to its opposite, the sum is always zero. This is because the opposite of a number is its negative counterpart, so when they are combined, they cancel each other out. For example, if you take 5 and add -5, the result is 0. This property holds true for any number.
zero + zero = zero
zero pair
They equal zero.
Zero can be expressed as the sum of any two opposite mixed number.
When a number is added to its opposite, the sum is always zero. This is because the opposite of a number is its negative counterpart, so when they are combined, they cancel each other out. For example, if you take 5 and add -5, the result is 0. This property holds true for any number.
𝗔𝗻𝘀𝘄𝗲𝗿: In mathematics, the opposite of a number is its additive inverse. The opposite of 15 would be the number that, when added to 15, yields a sum of zero. Therefore, the opposite of 15 is -15.
zero + zero = zero
The opposite of a number is its additive inverse, which means the number that, when added to it, results in a sum of zero. In this case, the opposite of 76 would be -76, as 76 + (-76) = 0. This relationship is based on the concept of symmetry around zero on the number line.
If we define "opposite" as the additive inverse, the sum is zero.
zero pair
They equal zero.
If zero is added to a whole number the answer would be the whole number because zero is the same as nothing
Zero can be expressed as the sum of any two opposite mixed number.
If the opposite is meant to be the additive opposite and not the multiplicative opposite, then their sum is zero. The reason is that is what defines an additive opposite!
WHOLE
If by "opposite" you mean "additive inverse", the sum is zero. For example, 5 + (-5) = 0.