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\(\dfrac{3}{4}\cdot\dfrac{4}{5}=\dfrac{3\cdot4}{4\cdot5}=\dfrac{3}{5}\) .

\(\dfrac{7}{8}\cdot\dfrac{8}{9}\)	\(\dfrac{81}{85}\)
\(\dfrac{81}{94}\cdot\dfrac{94}{85}\)	\(\dfrac{7}{9}\)
\(\dfrac{23}{30}\cdot\dfrac{105}{92}\)	\(\dfrac{1}{6}\)
\(\dfrac{15}{14}\cdot\dfrac{56}{105}\)	\(\dfrac{4}{7}\)
\(\dfrac{53}{57}\cdot\dfrac{19}{106}\)	\(\dfrac{7}{8}\)