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When expressed as a decimal, a rational number will either be terminating (end with a finite number of digits) or repeating (have a repeating pattern of digits).
It is either a terminating decimal or a repeating decimal.
That is the definition of a rational number.
Any rational number is either a repeating decimal, or a terminating decimal.
A terminating decimal is a rational number. A non-terminating, repeating decimal is a rational number. A non-terminating, non-repeating decimal is an irrational number.