[tex]a)\frac{3}{7}\cdot\frac{4}{9}=\frac{3\cdot4}{7\cdot9}=\frac{12}{63}= \frac{4}{21}\\ \\b)\frac{4}{9}\cdot\frac{5}{8}=\frac{4\cdot5}{9\cdot8}=\frac{20}{72}=\frac{5}{18}\\ \\c)\frac{3}{8}\cdot\frac{5}{9}=\frac{3\cdot5}{8\cdot9}=\frac{15}{72}= \frac{5}{24}\\ \\d)\frac{7}{2}\cdot\frac{4}{5}=\frac{7\cdot4}{2\cdot5}=\frac{28}{10}=\frac{14}{5}=2\frac{4}{5}\\ \\e)\frac{4}{7}\cdot\frac{5}{8}=\frac{4\cdot5}{7\cdot8}=\frac{20}{56} =\frac{5}{14}\\ \\f)\frac{5}{6}\cdot\frac{9}{8}=\frac{5\cdot9}{6\cdot8}=\frac{15}{16}[/tex]
