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Q: Can a rational number be a irrational?

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It is a rational number.

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

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

The square root of 29 is an irrational number.

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

Irrational. If you multiply a rational number by an irrational number, you will always get an irrational number (except if the rational number happens to be zero).

It is a rational number because it can be expressed as a fraction

It can be written as a fraction, so it is rational. It is not an integer, whole number or irrational.

No rational number is an irrational number.

The product of a rational and irrational number can be rational if the rational is 0. Otherwise it is always irrational.

If an irrational number is added to, (or multiplied by) a rational number, the result will always be an irrational number.

Next to any rational number is an irrational number, but next to an irrational number can be either a rational number or an irrational number, but it is infinitely more likely to be an irrational number (as between any two rational numbers are an infinity of irrational numbers).

Irrational.

5.4 = 5 2/5 = 27/5 so it is a rational number.

Integers are rational. In the set of real numbers, every number is either rational or irrational; a number can't be both or neither.

The sum of the three can be rational or irrational.

No number can be both rational and irrational. And, at the level that you must be for you to need to ask that question, a number must be either rational or irrational (ie not neither). 0.555555 is rational.

When a rational numbers is divided by an irrational number, the answer is irrational for every non-zero rational number.

Yes, 2.444 is a rational number.

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

It will be irrational.

It is always irrational.

If it can't be expressed as a fraction then it is an irrational number

The product of an irrational number and a rational number, both nonzero, is always irrational

No. In fact the sum of a rational and an irrational MUST be irrational.