Fraction $\frac{-4}{9}$ can be rewritten as $-\frac{4}{9}$ by extracting the negative sign.
$$sort(-\frac{4}{9},\frac{-5}{12})$$
Fraction $\frac{-5}{12}$ can be rewritten as $-\frac{5}{12}$ by extracting the negative sign.
$$sort(-\frac{4}{9},-\frac{5}{12})$$
Least common denominator of the numbers in the list $-\frac{4}{9},-\frac{5}{12}$ is $36$. Convert numbers in the list to fractions with denominator $36$.