\(\dfrac{3}{4}=\dfrac{3\times15}{4\times15}=\dfrac{45}{60};\dfrac{8}{15}=\dfrac{8\times4}{15\times4}=\dfrac{32}{60};\dfrac{19}{30}=\dfrac{19\times2}{30\times2}=\dfrac{38}{60};\dfrac{2}{3}=\dfrac{2\times20}{3\times20}=\dfrac{40}{60};\dfrac{4}{5}=\dfrac{4\times12}{5\times12}=\dfrac{48}{60}\)