The first thing you do is to make 2 1/2 a top-heavy fraction:
2 1/2 = 2 X 2 + 1 = 5/2
Now it's just division with fractions.
5/2 / 1/8
All you have to do is switch the 8 and the 1 around and then change the divide sign in a X:
5/2 X 8/1 =
40/2 = 20/1.
Carol has 20 servings of strawberry pie left.
