Well, you if a pitcher holds

of a gallon of water, and Roger filled up nine pitchers, you would multiply, however, drawing it out would be the best answer. If you draw nine pitchers, then you would count by 2. Then it would make 6 pitchers to make a gallon. So then you would have 3 left over. So you would have 1

. So you would have 1 1/2 gallons of water.