Q: Is 81 a rational number

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

Yes. The square root of 81 is 9 - a natural number and all natural numbers are rational numbers.

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…

No - because it can be represented as a ratio of integers : 81 = 81/1 Any number that can be represented as a ratio of 2 integers is classified as a rational number (other than that you can't use 0 for the denominator)

It is a rational number. It can be written as a fraction.

Related questions

81 is a rational number

The square root of 81 is 9 which is a rational number

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

n is a square of a rational number. For example, 4 or 81, or 2.25 or 36/25.n is a square of a rational number. For example, 4 or 81, or 2.25 or 36/25.n is a square of a rational number. For example, 4 or 81, or 2.25 or 36/25.n is a square of a rational number. For example, 4 or 81, or 2.25 or 36/25.

Yes, it is.

Yes and it is also a square number because 9*9 = 81

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

Yes. The square root of 81 is 9, which is a rational number.

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

Yes. The square root of 81 is 9 - a natural number and all natural numbers are rational numbers.

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.

Yes. It's +9 and -9. They're both rational.