[tex] a) \: \frac{4}{12} = \frac{1}{3} \\ \frac{4}{8} = \frac{1}{2} \\ \frac{3}{15} = \frac{1}{5} \\ [/tex]
[tex]b) \: \frac{6}{9} = \frac{2}{3} \\ \frac{8}{10} = \frac{4}{5} \\ \frac{6}{21} = \frac{2}{7} [/tex]
[tex]c) \: \frac{4}{16} = \frac{1}{4} \\ \frac{10}{50} = \frac{1}{5} \\ \frac{8}{30} = \frac{4}{15} [/tex]
[tex]d) \: \frac{15}{25} = \frac{3}{5} \\ \frac{28}{36} = \frac{7}{9} [/tex]
[tex]d) \: \frac{15}{25} = \frac{3}{5} \\ \frac{28}{36} = \frac{7}{9} \\ \frac{10}{70} = \frac{1}{7} [/tex]
