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cardinal (1, 2, 3, ...) and ordinal (1st, 2nd, 3rd, ...)

or rational and irrational

A rational number can be expressed as a fraction

ex: 22/7 is roughly 3.14, very close to pi, but not pi which is still real but...

Irrational - it cannot be expressed in the form of a fraction, other Irrational Numbers: sqrt(2), e.

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Q: What are the two categories of real numbers?
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What number categories does -3.75?

Negative rational numbers; Negative real numbers; Rational numbers; Real numbers. The number also belongs to the set of complex numbers, quaternions and supersets.


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rational numbers and irrational numbers


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The two main divisions are rational numbers and irrational numbers.


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Yes, square of 2 is a real number. Real numbers fall into 2 categories, Rational and Irrational. Square of 2 is an irrational number.


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