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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.

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0No, -81 is not an irrational number because it can be represented in the form x/y = -81

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

No it is a rational number

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

No because it can be expressed as a fraction in the form of 81/1

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)

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

No. The square root of 81/(-3) is rational. The square root of [81/(-3)] is imaginary (a kind of complex number).

Since it is the square root of a negative number, it is actually imaginary, neither rational nor irrational. It is equal to 9i, or 9 times whatever the square root of negative one is.square root of -81 = square root of 81 times i = 9i

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

No. The sum of an irrational number and any other [real] number is irrational.

No, but you can add an irrational number and a rational number to give an irrational.For example, 1 + pi is irrational.

No, 3.56 is not an irrational number. 3.56 is rational.

It is a rational number.

rational * irrational = irrational.

A negative irrational number can be thought of as an irrational number multiplied by -1, or an irrational number with a minus sign in front of it.

At least one of the factors has to be irrational.* An irrational number times ANY number (except zero) is irrational. * The product of two irrational numbers can be either rational or irrational.

Any irrational number, added to 0.4 will give an irrational number.

Any irrational number, when multiplied by 0.5 will give an irrational number.

When added to a rational number, any irrational number will produce an irrational number.also, when added to an irrational number, any rational number will produce an irrational number.

Yes, an irrational number divided by an irrational number will usually be an irrational number, but not always. For example, pi / (3pi) is 1/3, which is a rational number, but pi/e is an irrational number.

No. this is not a irrational number

Yes, it will always be irrational.

Wrong. It is always an irrational number.

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