CECmath.43 TITLE: Negative & Positive Numbers AUTHOR: Herb Colley, McLaren School; Woodburn, OR GRADE LEVEL: Appropriate for grades 4 and up. OVERVIEW: The concept of positive and negative numbers is difficult for students of all ages. These activities can help to reinforce the idea that we work with positive and negative numbers all of the time and that the concept is not difficult. OBJECTIVE(s): Students will be able to: 1. Recognize positive and negative numbers. 2. Perform mathematical functions using positive and negative numbers. 3. Identify and read positive and negative numbers on a thermometer. 4. Demonstrate positive and negative numbers on a graph. MATERIALS: Teacher materials = dry ice, acetone, electric hot plate or bunson burner, tape of football game, tape recorder, stock pages from newspaper, thermometer. Student materials = pencils, colored pencils, graph paper, thermometers. ACTIVITIES AND PROCEDURES: 1. Use dry ice and acetone to show cold temperatures on a thermometer, boiling water to show hot temperatures. 2. Using graph paper, plot the loss and gain of a player carrying the ball in a football game. 3. Using graph paper, plot the Dow Jones or Standard and Poor Averages. TYING IT TOGETHER: This can be used as one lesson or expanded to several as needed by students