Bell Ringer

1
Bell Ringer

• The seasonal snowfall for Barrow, Alaska, was 3
  inches above normal.
• The total rainfall this month is 2 inches below
  normal.
• l-5l
• l-4l l-3l

Write an integer for each situation.
Evaluate each expression.
2
3 2 Comparing and Ordering Integers

• KEY TERM
• Median the middle number in an ordered data set
• MATH SYMBOLS
• lt is less than
• gt is greater than

3
When am I going to use this?

• The Wind Chill Temperature
• Index table shows how cold air
• feels on human skin.
• What is the wind chill if there is a wind of 20
  miles per hour and the temperature is 5o?
• Which is colder, a temperature at 15o with a 20
  mile per-hour wind or a temperature of 10o with
  a 10 mile-per-hour wind?
• Graph both wind chills found on a number line.

4
Comparing Integers

• When two numbers are graphed on a number line,
  the number to the left is ALWAYS less than the
  number to the right. The number to the right is
  ALWAYS greater than the number to the left.

-5
1
0
-4
-1
-2
-3
2
The symbol points to the lesser number
-4 is less than -2 -4 lt -2
-2 is greater than -4 -2 gt -4
5
Compare Integers

• Replace the with lt or gt to make
• -5 -3 a true sentence
• Graph each integer on a number line.
• Since -5 is to the left of -3, -5 lt -3

-5
1
0
-4
-1
-2
-3
2
6
Your Turn

• -8 -4
• 5 -1
• -10 -13

Replace each with lt or gt to make a true
sentence.
7
Ordering Integers

• The lowest temperatures in Alaska, Florida,
  Hawaii, and Montana are listed in the table.
  Order the temperatures from least to greatest.
• -80, -70, 12, -2
• -80, -70, -2, 12
• 12, -2, -70, -80
• -2, 12, -70, -80

Graph integers on a number line
A
M
H
F
-90
-80
-10
-20
-30
-40
-70
-50
-60
30
20
10
0
8
Homework

• Page 570 Lesson 3-2
• 1-22 all