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Yes, 0.3 is a rational, for it can be written as a fraction. By definition, rational numbers are any numbers that can written as a fraction.

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Q: Is 0.3 a rational number

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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

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

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

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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.

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