If you consider terminating decimals as ones that end in repeating 0s, then the answer is "always".
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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.)
Sometimes. The number '4' is real and rational. The number 'pi' is real but not rational.
All repeating decimals are rational numbers. Not all rational numbers are repeating decimals.
always!