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Subjects>Math>Algebra

Is 81 a rational or irrational number?

Updated: 4/28/2022

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∙ 9y ago

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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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Continue Learning about Algebra

Is the root of 81 an irrational number?

No. The square root of 81 is 9, which is a rational number.

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10.01 is a rational number

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Is the product of a rational number and an irrational number rational or irrational?

Such a product is always irrational - unless the rational number happens to be zero.

The sum of a rational number and an irrational number is?

The sum of a rational and irrational number must be an irrational number.

Related questions

Is the root of 81 an irrational number?

No. The square root of 81 is 9, which is a rational number.

Is -81 an irrational number?

No, -81 is not an irrational number because it can be represented in the form x/y = -81

Is 81 a irrational number?

No. 81 is a rational number. An irrational number is a number with an endless amount of digits like pi or the square root of 2.

Is sqrt 81 a irrational number?

No because the square root of 81 is 9 which is a rational number

Is -81 is rational or irrational?

81*81 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.

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10.01 is a rational number

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it is a rational number but 4.121314..... is an irrational no

When an irrational number is divided by a rational number is the quotient rational or irrational?

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Is the product of a rational number and an irrational number rational or irrational?

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