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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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Related questions

How can you tell a number is an rational number?

When it can be expressed as a fraction


Is 0.91 rational?

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


How can you tell the difference between a rational number and an integer?

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


How do you tell if a number is rational or irrational?

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


Is the number 0.040040004.. rational or irrational number?

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


How can you tell whether a square root of a whole number is rational or irrational?

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


Is 1.234 is a not rational number?

It is a rational number


Is 3.456 a rational or irrational number?

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


Is the product of a rational number and a rational number a rational number?

yes


Is 77 a rational number or irrational?

It is a rational number.


Is 1.96 a rational number or an irrational number?

1.96 is a rational number


Is square root of 101 rational or irrational?

It is irrational.


Is 17.02 a rational number?

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Is 0.05 a rational or irrational number?

It is a rational number.


Is 9.0 rational or irrational?

9.0 is a rational number


Is a whole number 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


Is 0.74 a rational or irrational number?

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


Is a Rational number plus rational number equals rational number?

Yes, the sum is always rational.


Is a rational number plus a rational number always a rational number?

Yes, it is.


Is 5.75 repeating a rational number or irrational?

It is a rational number.


Is -8 a rational or irrational number?

-8 is a rational number


Is the sum of a rational number and a rational number rational?

Yes.


Is 14.1 a rational number or a integer?

It is a rational number, not an integer.


Is a rational number multiplied a rational number rational?

Yes.


What is a rational number number which is not a rational number?

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