17/24 + 3/8 =

\[\frac{17}{24} + \frac{3}{8} = \frac{17}{24} + \frac{3 \times 3}{8 \times 3} = \frac{17}{24} + \frac{9}{24} = \frac{17+9}{24} = \frac{26}{24} = \frac{13}{12} = 1\frac{1}{12}\]