[tex]a) \frac{3}{5} - \frac{7}{15} = \frac{9 - 7}{15} = \frac{2}{5} [/tex]
[tex] \frac{2}{6} + \frac{1}{12} = \frac{4 + 1}{12} = \frac{5}{12} [/tex]
[tex] \frac{7}{8} - \frac{1}{16} = \frac{14 - 1}{16} = \frac{13}{16} [/tex]
[tex] \frac{1}{10} + \frac{2}{5} = \frac{1 + 4}{10} = \frac{5}{10} = \frac{1}{2} [/tex]
[tex] \frac{3}{2} - \frac{5}{4} = \frac{6 - 5}{4} = \frac{1}{4} [/tex]
[tex] \frac{1}{2} - \frac{1}{8} = \frac{4 - 1}{8} = \frac{3}{8} [/tex]
[tex] \frac{4}{5} - \frac{1}{20} = \frac{16 - 1}{20} = \frac{15}{20} = \frac{3}{4} [/tex]
[tex] \frac{5}{2} + \frac{3}{4} = \frac{10 + 3}{4} = \frac{13}{4} [/tex]
[tex] \frac{3}{2} + \frac{5}{4} = \frac{6 - 5}{4} = \frac{1}{4} [/tex]
[tex] \frac{7}{3} - \frac{2}{6} = \frac{14 - 2}{6} = \frac{12}{6} = 2[/tex]
[tex]b) \frac{5}{3} \times \frac{4}{3} = \frac{20}{9} [/tex]
[tex] \frac{5}{6} \times \frac{8}{9} = \frac{5}{3} \times \frac{4}{9} = \frac{20}{27} [/tex]
[tex] \frac{7}{6} \times \frac{3}{2} = \frac{7}{2} \times \frac{1}{2} = \frac{7}{4} [/tex]
[tex] \frac{4}{6} \times \frac{5}{3} = \frac{2}{3} \times \frac{5}{3} = \frac{10}{9} [/tex]
[tex] \frac{9}{2} \times \frac{3}{5} = \frac{27}{10} [/tex]
[tex] \frac{7}{4} \times \frac{9}{8} = \frac{63}{32} [/tex]
