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
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Yes, negative decimal numbers are rational, as long as it is terminating or repeating.
a negative decimal number, a rational number, a nice number
Always
A number with a finite number of decimal digits is always rational. (If the number of decimal digits is infinite, the number is rational only if there is a repeating pattern.)