While writing Height: 5 feet  you could abbreviate it as Height: 5 2 . To write feet,  you must use the symbol prime  which is a single quotation mark  ' . For inches you must use a double quotation mark . Length: 9 feet  you would abbreviate it as Length: 9 2 .

There are 12 inches in a foot, so 56 inches is 4 feet, 8 inches (2/3 of a foot).