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Yes.

Yes, it is.

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No it's not a Rational Number

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Yes

Q: Is 0.31 a rational number

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yes

Yes.

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. Any rational number divided by another rational number is also rational.

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First of all , do not use the phrase ' not rational' . The word in the English language, and mathematics is 'IRRATIONAL'. Net 1.234 is rational; it can be converted to a ratio(fraction). For irrational numbers the decimals go to inifinity and there is no regular order in the decimal digits. 'pi' is probably the most well known irrational numbers at pi = 3.141592654... The three terminl dots/stops indicate to mathemticians, that the number goes to infinity. Notice also, there is no regular order of digits in the decimal moiety. Since the number given ends at '4' , then it does not go to infinity, hernce it is rational . To convert to a ratio (fraction) 1.234 = 1 234/1000 Cancel down by '2' 1 117/500 (THis is the fraction in its lowest terms).

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

30,031 is composite.

yes

Is 12.05 a rational number or irrational number?

1.96 is a rational number

9.0 is a rational number

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

Yes, the sum is always rational.

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

As much as, in these days of uncertainty, anything can be anything. As long as the constraints of a rational number are kept to, a rational number will always remain a rational number.

Yes, it is.