5.
[tex] \frac{1}{5} \times \frac{3}{4} = \frac{3}{20} [/tex]
[tex] \frac{4}{9} \times \frac{3}{5} = \frac{4}{3} \times \frac{1}{5} = \frac{4}{15} [/tex]
[tex] \frac{7}{12} \times \frac{4}{21} = \frac{1}{3} \times \frac{1}{3 } = \frac{1}{9} [/tex]
[tex]1 \frac{2}{5} \times \frac{5}{21} = \frac{7}{5} \times \frac{5}{21} = \frac{1}{1} \times \frac{1}{3} = \frac{1}{3} [/tex]
7.
[tex] \frac{6}{7} \div \frac{3}{5} = \frac{6}{7} \times \frac{5}{3} = \frac{2}{7} \times \frac{5}{1} = \frac{10}{7} = 1 \frac{3}{7} [/tex]
[tex]3 \div \frac{5}{6} = 3 \times \frac{6}{5} = \frac{18}{5} = 3 \frac{3}{5} [/tex]
[tex]1 \frac{1}{2} \div \frac{5}{7} = \frac{3}{2} \times \frac{7}{5} = \frac{21}{10} = 2 \frac{1}{10} [/tex]
