Analysis of information sources in references of the Wikipedia article "Natural number" in English language version.
Counting numbers (also called natural numbers): The set of numbers beginning 1, 2, 3, 4, ... and going on infinitely.
A counting number is the number given in answer to the question "How many?" In this class of numbers belongs zero and positive integers/
...the set of natural numbers is closed under addition... set of natural numbers is closed under multiplication
Addition of natural numbers is associative.