1/4 + 5/12 =

\[\frac{1}{4} + \frac{5}{12} = \frac{1 \times 3}{4 \times 3} + \frac{5}{12} = \frac{3}{12} + \frac{5}{12} = \frac{3+5}{12} = \frac{8}{12} = \frac{2}{3}\]