Would be that number.
Example: 7+0= 7
0+7=7
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If you add zero to any number, the sum is the same number you started with.
If we define "opposite" as the additive inverse, the sum is zero.
Identity Property of Addition
zero and any other positive number. Any positive number and a fraction (or decimal). Any positive number and a negative number, excluding zero.
Depends what the number is. If you were multiplying and did (substitute Z with any number)0xZ,the answer would always be zero. Actually the SUM is the answer to a addition problem. So the answer would be the number in which is to 0.