$\frac{4}{14}=\frac{4:2}{14:2}=\frac{2}{7}$
$\frac{3}{9}=\frac{3:3}{9:3}=\frac{1}{3}$
$\frac{4}{16}=\frac{4:4}{16:4}=\frac{1}{4}$
$\frac{10}{35}=\frac{10:5}{35:5}=\frac{2}{7}$
$\frac{17}{51}=\frac{17:17}{51:17}=\frac{1}{3}$
$\frac{16}{48}=\frac{16:16}{48:16}=\frac{1}{3}$
$\frac{15}{30}=\frac{15:15}{30:15}=\frac{1}{2}$
$\frac{14}{49}=\frac{14:7}{49:7}=\frac{2}{7}$
$\frac{12}{30}=\frac{12:6}{30:6}=\frac{2}{5}$
$\frac{28}{98}=\frac{28:14}{98:14}=\frac{2}{7}$
$\frac{63}{189}=\frac{63:63}{189:63}=\frac{1}{3}$
$\frac{7}{21}=\frac{7:7}{21:7}=\frac{1}{3}$
$\frac{6}{21}=\frac{6:3}{21:3}=\frac{2}{7}$
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