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81 as well as all whole numbers are rational numbers. Any number that can be written as a fraction is a rational number. An irrational number can be written as a decimal, but not as a fraction.

An irrational number has endless non-repeating digits to the right of the decimal point. An example of an irrational number would be pi:

π = 3.141592…
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Q: Is 81 a rational or irrational number?
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