Students begin by observing and discussing reasons for lines on a map to find locations.
Demonstrate with a balloon which has X's marked on it but no locator lines to find particular X's. Read the lesson on latitude and longitude. Students make bingo cards with the names of 25 cities of the western hemisphere on each. Read the latitude and longitude of each as students find the name of the city on a map and mark their cards. Proceed as in a regular bingo game.