$9\frac{3}{5} * \frac{10}{21} = \frac{48}{5} * \frac{10}{21} = \frac{16}{1} * \frac{2}{7} = \frac{32}{7} = 4\frac{4}{7}$

$3\frac{11}{12} * \frac{9}{94} = \frac{47}{12} * \frac{9}{94} = \frac{1}{4} * \frac{3}{2} = \frac{3}{8}$

$1\frac{5}{7} * 6\frac{1}{8} = \frac{12}{7} * \frac{49}{8} = \frac{3}{1} * \frac{7}{2} = \frac{21}{2} = 10\frac{1}{2}$

$3\frac{5}{9} * 5\frac{1}{4} = \frac{32}{9} * \frac{21}{4} = \frac{8}{3} * \frac{7}{1} = \frac{56}{3} = 18\frac{2}{3}$

$1\frac{13}{15} * \frac{5}{8} * 2\frac{2}{7} = \frac{28}{15} * \frac{5}{8} * \frac{16}{7} = \frac{4}{3} * \frac{1}{1} * \frac{2}{1} = \frac{8}{3} = 2\frac{2}{3}$

$2\frac{1}{4} * \frac{16}{27} * 4\frac{1}{3} = \frac{9}{4} * \frac{16}{27} * \frac{13}{3} = \frac{1}{1} * \frac{4}{3} * \frac{13}{3} = \frac{52}{9} = 5\frac{7}{9}$