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If you consider terminating decimals as ones that end in repeating 0s, then the answer is "always".
Repeating decimals are ALWAYS rational numbers.
A terminating or repeating decimal is always rational. Whether it is positive or negative makes no difference. So the answer is no it is not always rational, such as -1/pi
Rational numbers can always be expressed as fractions.
Sometimes. The number '4' is real and rational. The number 'pi' is real but not rational.