$$\frac{3}{5}$$
Explanation:
To express the fraction in the simplest form, look for a common factor that divides into both $$30$$ and $$50$$.
Since both numbers have the last digit of $$0$$, this informs us that they are divisible by $$5$$ and $$10$$.
In this case, choose the larger factor of $$10$$ to divide by.
$$\frac{30}{50}=\frac{30\div10}{50\div10}=\frac{3}{5}$$ in simplest form.
A fraction is in simplest form when no other factor but $$1$$ will divide into the numerator/denominator.