The document discusses converting between standard units of length, including inches, feet, yards, and miles. It provides the equivalencies that there are 12 inches in 1 foot, 3 feet in 1 yard, and 1,760 yards in 1 mile. It then gives examples of converting between units by calculating how many inches are in 2 feet, yards are in 9 feet, and inches are in 2 yards. Finally, it presents a word problem asking the reader to convert between units to determine which of three plants listed in different units is the tallest and shows the work and solution.