A natural number but not a whole number?

Answer 1

On a maths assignment for school, the answer is probably "0," but the question is not well worded.

Because mathematicians sometimes disagree on the definitions of "whole number" and "natural number" (specifically, whether "0" is included in one set or the other), it is probably best to use more descriptive terms like "positive integers" and "non-negative integers." Here are safer definitions to use:

Integer: a member of the set {..., -2, -1, 0, 1, 2, 3, ...}
Positive integer: a member of the set {1, 2, 3, 4, ...}
Non-negative integer: a member of the set {0, 1, 2, 3, 4, ...}