Adding Fractions by Boxed Rockets

\frac{2}{3} + \frac{1}{3}

\frac{3}{3} = 1

\frac{1}{4} + \frac{1}{4}

\frac{2}{4} = \frac{1}{2}

\frac{2}{7} + \frac{2}{7}

\frac{4}{7}

\frac{6}{20} + \frac{1}{4}

\frac{11}{20}

\frac{1}{3} + \frac{3}{8}

\frac{17}{24}

\frac{3}{15} + \frac{2}{3}

\frac{13}{15}