צמצמו או הרחיבו בשתיים:

${\displaystyle {\frac {6}{20}}}$

${\displaystyle {\frac {10}{24}}}$

${\displaystyle {\frac {2}{4}}}$

${\displaystyle {\frac {7}{15}}}$

${\displaystyle {\frac {3}{13}}}$

${\displaystyle {\frac {5}{7}}}$