GETTING STARTED… 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

LESSON 3.4SUBTRACTING

INTEGERS

Subtracting an integer is the same as adding its opposite.

If a and b are integers,

a – b = a + (-b)

SUBTRACTING INTEGERS

LET’S SEE HOW THIS WORKS…http://www.neirtec.org/activities/applets/numberline.htm

SIMPLIFY: -5 – 4 =

23 – 48 =

-5 + (-4) = -9

23 + (-48) = -25

WRITE A SUBTRACTION PROBLEM, THEN FIND THE DIFFERENCE 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

HOMEWORK Extra Practice 3.4