If they are non-terminating and there is a repeating pattern, then they are rational. If they are non-terminating and there is no repeating pattern, as in pi, they are irrational.
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Repeating decimals are ALWAYS rational numbers.
No. Rational numbers are either terminating decimals or non-terminating BUT recurrent decimals.
All repeating decimals are rational numbers. Not all rational numbers are repeating decimals.
Yes.
Yes, negative decimal numbers are rational, as long as it is terminating or repeating.