Yes. 1/5 = 0.2, which is rational*.
*A irrational number is one that cannot be expressed by a quotient, or fraction, of integers;for e.g., Pi = 3.141592..., infinitely, without ever repeating a finite sequence, is a real but irrational number.
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Yes.
Yes. In fact, most factions are rational. For example, 4/5 is rational, 9/234 is rational, 1/998001 is rational, any whole number over a whole number is rational.
9/16
5 = 5/1 is a rational number
It is real and irrational.