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Yes.

Yes, it is.

Q: Is 90 a rational number

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yes

The answer to the question that is given is 344444444/1000000000. This simplifies to 86111111/250000000.However, if your original number was meant to be 0.344... recurring, the answer is 31/90.

Yes.

It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.

yes

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Since it can be written as a fraction (9.0 = 90/10), then it 9.0 is a rational number.

No.

No.

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

-90 squared is rational - it is +8100. All perfect squares are not only rational but they are integers.

yes

Is 12.05 a rational number or irrational number?

1.96 is a rational number

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

Yes, the sum is always rational.

No, it is not.

There is no such thing as a number that is both rational and irrational. By definition, every number is either rational or irrational.