hierarchy of numbers - math 110

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Last updated 3:45 PM on 9/23/26

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1

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real numbers

numbers that consist of rational and irrational numbers

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rational numbers

any number that can be expressed as a fraction

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irrational numbers

numbers that can’t be expressed as a fraction (sq root of 2, pi)

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integers

whole numbers and their opposites; doesn’t include the fractions in between

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whole numbers

positive integers including 0

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natural numbers

“counting numbers”; whole numbers starting at 1