Rational numbers are numbers that can be written as a fraction. Irrational Numbers cannot be expressed as a fraction. You must make sure it can be written as a fraction.
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By leaving at it is because 3.0 is already a rational number
It can be rounded to 3.14, this however does not make it a rational number.
They make a rational number.
3.5 is a rational fraction and there is no sensible way to make it into a whole 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.