A rational number is a number that can be expressed as a/b. a and b must both be integers. For any finite decimal, you can multiply by a power of 10 to get an integer. In this case, you can multiply by 1,000 to get 682. Therefore, 0.682 can be expressed as 682/1,000. This is why 0.682 is rational.
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No, it is rational.
It is rational. It is rational. It is rational. It is rational.
"Rational" is an adjective and so there cannot be "a rational" (and certainly not "an rational"). Any answer would depend on whether the question was about a rational number, a rational person, a rational argument or "a rational" combined with some other noun.
It is rational.
It is rational.