0
Yes.
A rational number is any number that can be expressed as a fraction (one integer divided by another). Any decimal number that is finite (i.e. the sequence of digits comes to an end, such as in the above number) or infinitely repeats a series of digits (such as 0.3 recurring; i.e. 1/3) can be expressed as a fraction and is therefore rational.
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Is a rational number always a rational number?
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.
Is the sum of a rational number and a rational number rational?
Yes.
Can you multiply an irrational number and a rational number to get a rational number?
Yes, but only if the rational number is 0.
Can a rational number be multiplied by an irrational number and equal a rational number?
Only if the rational number is 0.
How is a rational number that is not an integer different from a rational number that is an number?
A rational number which is an integer can be simplified to a form in which the denominator is 1. That is not possible for a rational number which is not an integer.
