Adding Fractions with Same Denominator: 3/13 + 7/13

To solve this problem, we add the fractions $\frac{3}{13}$ and $\frac{7}{13}$ which have the same denominator.

When fractions have the same denominator, we simply add the numerators and place the sum over the common denominator.

$\frac{3}{13} + \frac{7}{13} = \frac{3 + 7}{13} = \frac{10}{13}$

The sum of the numerators is $10$ and the denominator remains $13$.

Therefore, the solution to the problem is $\frac{10}{13}$.