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Whole number

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Definition: A whole number consists of no fractions, such as 0, 1, 2, 3, and so on. It includes natural numbers and zero.

Three circles overlay to represent the relationship between integers, whole numbers, and natural numbers. Natural numbers are counting numbers, such as 1, 2, 3, etc. Whole numbers are natural numbers plus zero. And integers are whole numbers plus negative whole numbers.
Figure 21.1 Integers, whole numbers, and natural numbers.