One recipe calls for 3/4 cup of milk. A different recipe calls for 1/2 as much milk as the first recipe. How much milk does the second recipe call for?
For this problem you need to divide 3/4 by 2. For division of fractions, invert and multiply.
2/1 = 1/2
3/4 • 1/2
3 • 1 = 3
4 • 2 = 8
1/2 of 3/4 cup of milk = 3/8 of a cup of milk.