In the whole numbers, what can you say about the predecessor of 0?

Class 6Whole NumbersWhole Numbers

AIt is -1
BIt is 0 itself
CIt does not exist among the whole numbers
DIt is 1

Step-by-Step Solution

One less than 0 is -1, but -1 is a negative integer, not a whole number. So inside the whole numbers 0 simply has no predecessor. Choosing -1 is the usual slip: it answers "what is one less than 0?" instead of "which WHOLE number comes just before 0?"

Answer: C) It does not exist among the whole 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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