### Sue Garl

#### Description

In this game a student challenges a partner to recreate his quadrilateral or other shape on a geoboard by calling out the ordered pairs of the quadrilateral's vertices.

#### Objectives

The student identifies the x and y axes in a coordinate plane and identifies the coordinates of a given point in the first quadrant.

The student plots specific points in the first quadrant of the Cartesian coordinate system.

#### Materials

-Overhead of quadrant 1 (most math books have this in the teaching tools materials.)
-Geoboards, clear if possible - one for each student OR worksheets of quadrant 1
-Geobands or rubber bands, one for each student
-Thin masking tape if needed for modifications
-Markers if needed for modifications
-Paper and pencil for each student

#### Preparations

1. Gather materials for activity.
2. Make copies of practice worksheets.
3. Make copies of “game “ sheets if not using geoboards.

#### Procedures

1. Ask students how they find specific points on a map.

2. Discuss the similarities between a grid and quadrant.

3. Discuss how search and rescue teams use grids/quadrants to map out areas to be searched.

4. Recall the Battleship game and how it’s played.

5. Using the overhead of quadrant 1 of a coordinate plane, review the axes from previous graphing lessons.

6. Explain the new vocabulary words: “origin”, “quadrant” “coordinates” and “coordinate plane” and how the x and y axes are written as coordinates.

7. Plot several coordinates on the overhead and ask students to name the coordinates. Reverse the procedure and give coordinates , having students come up to the overhead and plot the point. You may also want to furnish students with hard copies of the quadrant and have them mimic your overhead work on their paper. Students may partner check while you circulate to individually check understanding.

8. When you are confident that most students have grasped the concept, pass out the geoboards and rubber bands or clean copies of quadrant 1.

9. Have students practice plotting coordinates by having them play the following game: Seat students back to back with their partner. Designate partner number 1 and number 2. Have partner number 1 form a quadrilateral or other geometric figure on his geoboard with the rubber band. He will write down all 4 coordinates then will call out the coordinates, one set at a time, to his partner who will try to recreate the original quadrilateral. Demonstrate procedure to the class.

10. Students can check their results by placing clear geoboards on top of each other. If opaque geoboards or paper and pencil are used, students will visually check their results. Discussions (arguments?) about what coordinates were called are avoided because the student has written down the coordinates before he shared them. Repeat with partner 2 forming a quadrilateral, writing down the coordinates, and then calling the coordinates to partner 1. Repeat as often as the teacher feels is necessary for students to master the concept. Students may want to keep score to see who was most successful.

#### Assessments

This is a formative assessment.
Circulate around the room, making sure all students are successsful in listing coordinate planes and reproducing the quadrilateral by correctly placing the rubber band on the assigned points. Having students keep score of successes and casual interviews will help with the observations.

#### Extensions

For students who are having difficulty mentally assigning coordinates: Prepare ahead of time, several geoboards with tape on the edges. Mark x and y axes on it. If paper and pencil are used, have hard copies with the axes labeled.