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What is the additive identity in the real numbers?

Answer and explanation

Correct answer: 0

The governing concept is the identity property of addition. An additive identity is a number that leaves every number unchanged when it is added to that number. For any real number x, the defining relation is x + 0 = 0 + x = x. Therefore, zero is the additive identity in the set of real numbers, and option C is correct. Option A is not an additive identity because x + 1 is generally greater than x. Similarly, adding −1 changes most numbers, so option B cannot be correct. Adding 2 also changes the original number. Notice that 1 is the multiplicative identity because x × 1 = x; this distinction helps avoid confusing the identities for addition and multiplication.

Related tags

Real NumbersAdditive IdentityNumber PropertiesNumber SystemsMathematicsClass 9 Mcq

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