Students use rates between measurements to convert measurement in one unit to measurement in another unit. Vocabulary: length, mass, weight, capacity, metric system, U.S. customary system, kilo-, deci-, centi-, milli-. Identify the ratios that are associated with conversions between feet, inches, and yards. Conversion tables are really ratio tables that can be used to convert units of length, weight, or capacity (and other units, too). Make a ratio table that compares feet and Allow students to solve the problem using the conversion chart.