3/10+4/10

To add the fractions \( \frac{3}{10} \) and \( \frac{4}{10} \), you simply add the numerators since the denominators are the same:

\[ \frac{3}{10} + \frac{4}{10} = \frac{3 + 4}{10} = \frac{7}{10} \]

So, \( \frac{3}{10} + \frac{4}{10} = \frac{7}{10} \).