1.  Construct a stem and leaf plot: 15, 4, 28, 23, 21, 9, 8, 11, 15, 9 1 leaf 0 stem 2 4, 8, 9, 9 1, 5, 5 1,3, 8

3.  Subtracting an integer is the same as adding its opposite.  If a and b are integers, a – b = a + (-b)

4. http://www.neirtec.org/activities/applets/nu mberline.htm

5.  -5 – 4 =  23 – 48 = -5 + (-4) = -9 23 + (-48) = -25

6.  Your score in a game is 5. In the next play, you lost 8 points. What is your score now?  The temperature on the moon can vary from around 130˚C to - 150 ˚C. How many degrees does the temperature vary on the moon? 5 – 8 = -3 points |130 – (-150)| = 280 degrees

7.  Extra Practice 3.4