- A0
- B1
- C-1
- D2
Step-by-Step Solution
Zero is the additive identity: a + 0 = a for every whole number a. So the answer is 0.
Answer: A) 0
Which whole number, when added to any whole number, leaves it unchanged?
Class 6Whole NumbersWhole Numbers
Key idea: Closure: when an operation 'stays inside' the whole numbers
Adding two whole numbers always gives a whole number — addition is **closed** on whole numbers. Multiplying two whole numbers always gives a whole number — multiplication is **closed** too. But subtraction is **not** closed: 5 − 7 = −2, which is not a whole number. Division is also not closed: 7 ÷ 2 = 3.5, not a whole number. Closure is the property that lets us trust an operation never to take us 'outside' the world of whole numbers.
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