Half a foot, six inches. Third of a foot, four inches. Quarter of a foot, three inches. Sixth, eighth, and twelfth also go into whole inches. For bigger projec

Half a foot, six inches. Third of a foot, four inches. Quarter of a foot, three inches. Sixth, eighth, and twelfth also go into whole inches. For bigger projects, yards are fairly easy to decompose too, into whole feet and inches. It's a good system for projects of human or slightly super-human scale using low resolution instruments and mental math. It's rotten for high precision computerized tasks of widely varying scales.