# How do you evaluate 3/9 + 4/5?

$1 \frac{2}{15}$
To add fractions the denominators must be the same. $\frac{3}{9}$ can be simplified to $\frac{1}{3}$, so the sum becomes $\frac{1}{3} + \frac{4}{5}$. The lowest common denominator for $3$ and $5$ is $15$, so we multiply $\frac{1}{3}$ by $\frac{5}{5}$, resulting in $\frac{5}{15}$ and we multiply $\frac{4}{5}$ by $\frac{3}{3}$, resulting in $\frac{12}{15}$. Now we can add the two fractions:
$\frac{5}{15} + \frac{12}{15} = \frac{17}{15} = 1 \frac{2}{15}$