16. Susan needed 2/6 of a pound of sugar for 1 batch of cookies. She made seven and a half batches of cookies. How much sugar did she use?
The 2/6 lb per batch is a rate. We multiply the number of lb/batch by the number of batches to get the number of lbs.
First notice that the 2/6 reduces to 1/3. It would be a good idea to reduce it before doing anything else. Next, since we are multiplying mixed numbers, change the mixed number to an improper fraction.
If we change the 5/2 to a mixed number, she used 2 and 1/2 lb of sugar.