# A student earned a grade of 80% on a math test that had 20 problems. How many problems on this test did the student answer correctly?

$16$
First you convert 80% into a decimal which is $.80$ then you multiply it by $20$.
$.80 \times 20 = 16$
We multiply it by $20$ because that's our total and by $.80$ because that's the amount that we got correct. Had it been 100% then that would mean we got every question right.