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The number line shows the whole numbers, starting from the smallest one at the orange point. Which number is hidden by ?

Class 6Whole NumbersWhole Numbers
  • A1
  • B0
  • C−1
  • DThere is no smallest whole number

Step-by-Step Solution

Whole numbers are 0, 1, 2, 3, … The ticks are equally spaced and the first label after ? is 1, so ? is , the smallest whole number. (1 is the smallest NATURAL number; −1 is not a whole number.)
Answer: B) 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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