\(\dfrac{1}{5} \div \dfrac{4}{5}\) equal to:
\(\dfrac{4}{5}\)
\(\dfrac{1}{5}\)
\(\dfrac{5}{4}\)
\(\dfrac{1}{4}\)
Divide by multiplying with reciprocal: \(\dfrac{1}{5}\times\dfrac{5}{4}=\dfrac{1}{4}\).