1. 2.1 Integers and absolute value
Objective: Students will be able to tell me what the absolute value of a number is. They will also be able to plot a point on a number line in relation to a given number. Finally, students will show that they understand how to solve a variable expression with an absolute value problem involved.

2. Definitions Integers: positive/negative whole numbers.
Negative integers: integers less than zero.
Larger neg. #, smaller amount
Positive integers: integers more than zero.
Larger pos. #, larger amount
Zero neither positive or negative.
From the list which ones are integers.
3/4, 5, -26, .54

3. Which Numbers below are integers?
5, 4.5, 6/7, 23, -8
4, 2/3, 8.9, -32, 534, 0.3
Write Integers.
Loss of 5yds
22 below zero
Increase of 45%
Deposit of $60

4. Write integer for situation?
Grade lowered by 8pts
The temperature fell 4 degrees
Gained $4000 in stock market
Loss of 10yds
23 above zero
Increase of 45%

5. Definitions Coordinate: point on line goes with number.
Order using number line
2, -5, 8, 10, 9, -8, -1

6. Student Example Order by using number line. 8, 5, -11, 0, -3
Order the following numbers from least to greatest.
-14, 11, -12, 7, -9

7. Absolute Values Absolute value: distance from zero on a number line.
Uses l n l symbols
Ex: l 8 l
Final answer positive!
Ex: l -9 l = 9
Find absolute value.
l 98 l =
l -6 l =
l -11 l =

8. Student Examples state the absolute values
l 100 l
- l 102 l
l -12 l
l 78 l
- l 173 l
l 214 l
l -131 l
l 65 l

9. variable expressions Examples: Solve when x = -5
Will do these all year long!!!!
To solve, substitute number for each variable.
Examples: Solve when x = -5 -x
12 – l x l
- l x l

10. Student Examples Solve when x = 6 l x l + 9 5 l x l 36 / l x l

11. Wrap up
Questions/Comments
Ic:
Hw: