What is a whole number that is not a counting number?

Answer 1

The answer will depend on the exact definition of both "whole number" and "counting number" as both terms are potentially open to different interpretations.

For example, a counting number could be defined as all the positive integers, e.g. 1,2,3,4 etc... A whole number could be defined as all the non negative integers, e.g. 0,1,2,3,4 etc.. In which case the answer would be 0.

However, it could be argued that counting numbers include 0, making the above answer invalid. Equally it could be argued that whole numbers include the negative integers, in which case the answer would include any negative whole number.