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Natural numbers are a subset of the integer numbers, which in turn is a subset of the rational numbers, and this of the real numbers. Therefore, all natural numbers are integers, rational, and real. Depending on the intended use, 0 may or may not be considered a natural number. Definition of Natural Numbers explained with real life illustrated examples. Also learn the facts to easily understand math glossary with fun math worksheet online at SplashLearn. Note: Natural numbers do not include negative numbers or zero. In this article, you will learn more about natural numbers with respect to their definition, comparison with whole numbers, representation in the number line, properties, etc. Natural Numbers on Number Line Natural numbers are represented by all positive integers or integers on the right-hand side of 0, whereas whole numbers are represented by all positive integers plus zero.