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If you can write the number as a fraction, with integers in the numerator and the denominator, it is rational. In the case of decimal numbers, if the decimal representation terminates (e.g. 2.16), or is periodic (perhaps after some initial digits, like 4.130202020202...), then it is rational. For numbers defined according to some rule, it is not always known whether they are rational or irrational.

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Q: How can you tell that a number is rational?

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When it can be expressed as a fraction

Yes. You can tell because there is a finite number of decimal places. 0.91 = 91/100 which is a rational number.

You probably don't have to inspect that pair too closely.Every integer IS a rational number.

a rational number repeats but terminates.ex:3.333333333. a irrational number doesn't terminate or repeat itself. ex:3.334334433444.

It is not possible to tell. There is no recurring pattern that can be discerned.

If the whole number is a perfect square, its square root is rational. If not, it's not.

It is a rational number

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

yes

It is a rational number.

1.96 is a rational number

It is irrational.

Is 12.05 a rational number or irrational number?

It is a rational number.

9.0 is a rational number

you mean is a whole number a rational number? and yes it is and rational number. Any number that can be put in a fraction is a rational number

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

Yes, the sum is always rational.

Yes, it is.

It is a rational number.

-8 is a rational number

Yes.

It is a rational number, not an integer.

Yes.

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