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==Disputes==
==Disputes==
Some math textbooks, particularly on the college level, include zero. Most elementary school textbooks distinguish between the ''[[whole number]]''s (i.e., non-negative [[integer]]s 0,1,2,...) and the ''[[counting number]]''s (i.e., positive integers 1,2,3,...) - defining natural numbers as identical to counting numbers.
Some math textbooks, particularly on the college level, include zero. Most elementary school textbooks distinguish between the ''[[whole number]]''s (i.e., non-negative [[integer]]s 0,1,2,...) and the ''[[counting number]]''s (i.e., positive integers 1,2,3,...) - defining natural numbers as identical to counting numbers.
* "Natural Numbers" can mean either "Counting Numbers" {1, 2, 3, ...}, or "Whole Numbers" {0, 1, 2, 3, ...}, depending on the subject.<ref> [http://www.mathsisfun.com/whole-numbers.html Math Is Fun website]</ref>
Students need to check the definition used in their textbook to avoid having test questions marked "wrong".
Students need to check the definition used in their textbook to avoid having test questions marked "wrong".