To find what part of a mile 1320 feet are, we must first know how many feet are in one mile. There are 5280 feet in one mile. But, to find out what part of a mile a certain number of feet are, we divide the number of feet in question (in this case 1320) by the number of feet in one mile. 1320/5280 is 0.25, so 1320 feet are 0.25 of a mile.
