How can I do the math to figure how many gallons are in 48 fluid ounces?

First convert fluid ounces to cups by dividing by 8 (6 cups) then convert cups to pints by dividing by 2 (3 pints) then pints to quarts by 2 ( 1.5 quarts) then gallons by dividing by 4 (0.375 gallons)