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Is the root of 81 an irrational number?
No. The square root of 81 is 9, which is a rational number.
Is the square root of 81 rational?
Yes. The square root of 81 is 9 - a natural number and all natural numbers are rational numbers.
Is 81 a rational or irrational number?
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…
Is the number 81 irrational?
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)
Is 3.456 a rational or irrational number?
It is a rational number. It can be written as a fraction.
