Ollie used 1/2 cup of vegetable oil to make brownies. she used another 1/3 cup of oil to make muffins. How much more oil did she use to make brownies?

Do 1/3-1/2
to do this find lcm and multiply by fractions
lcm (least common multiple) in this case is 6 so change the denominators of both fractions to 6 by multiplying 1/3*2/2 and 1/2*3/3

you'll get 2/6-1/6=1/6

1/6 cup of oil is the answer
tell me if u need me to explain it a different way