This means:
There are various ways of doing this; here are two:
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Rational
If you can write down the number completely, using digits, decimals, and fractions, then it's rational.
If you can completely write a number, using digits, fractions and decimals, then the number is rational. You appear to have accomplished that.
Not necessarily. The value of 3 (rational) raised to the power 1/2 (rational) is not rational.
If you can completely write a number, using digits, fractions and decimals, then the number is rational. You appear to have accomplished that.