Their denominators have prime factors of 2 or 5.
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Yes, terminating decimals are always rational numbers.
Terminating and repeating decimals are rational numbers.
All terminating decimal numbers are rational.
They are always rational numbers.
There is nothing that you can conclude.They could be recurring decimals or terminating decimals [as rational numbers, there is no other form].They may or may not be in their simplified or reduced form: for example 14/7 is a rational number with a prime denominator but it can be simplified.