Question

A field goal kicker makes 4 of 5 extra points during a game . What percent of extra points were made

Answer 1

80% of extra points were made.

Answer 2

Percent is $\frac{percent}{100}$. and if the kicker makes $\frac{4}{5}$, just compare the two like this:
$\frac{4}{5} = \frac{x}{100} \\ 4*100=5*x\\ x=\frac{400}{5}=80$
So the percent of extra kicks the kicker made is 80%.