Question

Add the following rational numbers:
$$\dfrac {-2}{5}$$ and $$\dfrac {4}{5}$$.

Answer 1

Let us add the fractions $$\dfrac {-2}{5} + \dfrac {4}{5}$$
Since it has the same denominator we can add directly,
$$\dfrac {-2 + 4}{5}\Rightarrow \dfrac {2}{5}$$.