A rational number (with a terminating decimal representation or a repeating, non-terminating decimal representation) can always be expressed in fractional p/q form.
I don't think the additional "rational" qualifier is needed for fractions.
Your comment brought me to the realization that the relationship doesn't hold both ways. A rational number can always be written as a fraction but a fraction is not always rational. Never considered this before today :)
ben_w|4 years ago
1/pi is not rational and therefore not “a rational fraction”, but think 1/pi is “a fraction”.
caddybox|4 years ago