Answer
$\frac{7}{45}$
Work Step by Step
$\frac{21}{81}\times\frac{63}{105}$
Simplify each fraction.
$\frac{21}{81}=\frac{7}{27}$, $\frac{63}{105}=\frac{3}{5}$
Use cross-simplification to further reduce before multiplying.
$\frac{7}{27}\times\frac{3}{5} = \frac{7}{9}\times\frac{1}{5}$
Multiply.
$\frac{7}{9}\times\frac{1}{5} = \frac{7}{45}$
