Zero. It's called the "additive identity" because when you add 0 to some number you always end up with the same number, like 17 + 0 = 17.
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When you multiply a number times 1, you can get the same number multiplicative identity. When you add a 0 to a number, you can get the same number additive identity.
If you add the identity element - namely zero - to a number, you will get the same number back.
Identity properties do not change a number. What can you add to a number that doesn't change it? 0 So the addition property for zero is additive identity.
Yes. 0 is the additive identity, ie when it is added to any number it results in the same number.
The additive identity for rational, real or complex numbers is 0.