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Which of the following is a whole number but NOT a natural number?

Class 6Whole NumbersWhole Numbers
  • A0
  • B1
  • C-1
  • D0.5

Step-by-Step Solution

Whole numbers are 0, 1, 2, 3, …. Natural numbers start at 1. So 0 is the only whole number that is not a natural number. (-1 and 0.5 are not whole numbers at all.)
Answer: A) 0

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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