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If you can completely write a number, using digits, fractions and decimals,

then the number is rational.

You appear to have accomplished that.

Q: Is 27 a rational or irrational number?

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Irrational.

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

Yes, 27 is a real number. Real numbers include all rational and irrational numbers, and 27 is a rational number because it can be expressed as a fraction, 27/1.

If you can completely write a number, using digits, fractions and decimals, then the number is rational. You appear to have done that.

No.A rational times an irrational is never rational. It is always irrational.

Related questions

No, it is rational.

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

10.01 is a rational number

No it is rational. It can be written as 27/10.

The square root of 27 is an irrational number

Rational

It is a rational number.

is 34.54 and irrational or rational. number

It is a whole number and it can be written as a fraction, so it is rational.

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

Irrational.

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