Math Problem Solver

$$\frac{2}{5} + \frac{3}{10} = \frac{7}{10} = 0.7$$

The sum can be computed by rewriting each term over a common denominator, where the least common denominator of $\frac{2}{5}$ and $\frac{3}{10}$ is $10$. $$\begin{aligned} \frac{2}{5} + \frac{3}{10} &= \frac{2 \cdot 2}{5 \cdot 2} + \frac{3 \cdot 1}{10 \cdot 1} \\ &= \frac{4 + 3}{10} \\ &= \frac{7}{10} \end{aligned}$$