Distribute maps of the Untied States. Have students locate Philadelphia. Look at the scale on the map. Distribute rulers and discuss how one would estimate the distance between Philadelphia and other cites. Group students in groups of two or three and have them determine the approximate distance between the cities on the following worksheet and Philadelphia.
Record answers in first column.
Record the distance in the second column and compare with the estimation. This site will tell you the distance between any two cities. It also gives the county, type, location, population and elevation. This site gives directions for driving between two cities. Maps are included.