Question

Matt has answered 20 over 25 of the questions on a test. what percentage of the test question has Matt answered

Answer 1

So,

Matt answered 20 out of 25 questions.
$\frac{20}{25}$

We need to get the denominator to be 100.  We can do that by multiplying the fraction by a form of 1.
$\frac{20}{25} * \frac{4}{4} = \frac{80}{100}$

From here, it should be easy to see that Matt has answered 80% of his test.

Answer 2

80% because 25 goes into 100 4 times and 20 times 4 equals 80.