Posted on : 08-06-2009 | By : InteractiveEducator | In : The Coordinate Plane
1) Display the graph paper image from the first link for the whole class. Then, with your interactive white board pen or with a marker after projecting the image on a dry erase board, place a dot somewhere on the paper. Tell your students that in four minutes you are going to erase the dot and turn off the projector. Then, you are going to project the image again and call on a student, and you expect them to be able to place the dot in the same location.
*Note: Brainstorming for ideas on how to find the location to place the dot can be done individually, with partners, or in groups.
2) Erase the dot, remove the projected image, and then project the image again. Call on a student and have them place the dot where they think it was previously located. (If a student is correct the first time, you can move on to the discussion. If a student is not correct, call on students until someone correctly places the dot.) Discuss strategies the students used to remember where the dot was located.
3) Discuss real life systems that are used to locate exact locations such as on maps, on globes, and with GPS. Why do we use these systems?
4) Use the second link to introduce the coordinate plane and its system for locating points using x and y axes. This manipulative can display all four quadrants or just the first quadrant. Explain how points in the coordinate plane are named in ordered pairs. Then, alternate drawing points and having the students write the correct ordered pairs with naming ordered pairs and having the students locate the points.