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# What is an integer in math?

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Integers are positive and negative whole numbers, including zero. As with whole numbers, integers do not include fractions or decimals. Integers are a part of the numerical classification system in mathematics.

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Adding, subtracting and multiplying two integers always results in another integer. The ratio, or division, of two integers is a rational number. A number line is a way to graph and to add and subtract integers by counting forward and backward. Integers are the second set in the hierarchy of numbers, which includes the subset of all natural numbers as integers. Real numbers and rational numbers include all integers.

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