Subtracting Fractions by Boxed Rockets

\frac{2}{3} - \frac{1}{3}

\frac{1}{3}

\frac{3}{8} - \frac{2}{8}

\frac{1}{8}

\frac{9}{10} - \frac{2}{10}

\frac{7}{10}

\frac{15}{20} - \frac{8}{12}

\frac{5}{60} = \frac{1}{12}

\frac{9}{12} - \frac{2}{5}

\frac{21}{60} = \frac{7}{20}

\frac{1}{4} - \frac{1}{12}

\frac{2}{12} = \frac{1}{6}