1. Representing INTEGERS

2. What is an Integer?
An INTEGER is any negative or positive whole number:
Examples:
…-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5…
No Fractions, No Decimals

3. Positive INTEGERS (+) “go UP” “Earn” “Rose / Rise” “Increase” “Gained”
KEY WORDS:
“go UP”
“Earn”
“Rose / Rise”
“Increase”
“Gained”
“In”
“Ascend”
“Above Zero”

4. Negative INTEGERS (-) “Down” “Spend” “Fell / Dropped” “Decrease”
KEY WORDS:
“Down”
“Spend”
“Fell / Dropped”
“Decrease”
“Lost”
“Out” “Descend”
“Below Zero”

5. Many situations can be represented with INTEGERS
Many situations can be represented with INTEGERS. Sometimes the situation must be represented by a Positive Integer, sometimes by a Negative Integer.
EXAMPLES:
An elevator moves down 3 floors = -3
Sue earned $5 for babysitting = +5
The stock market fell 20 points = -20
The balloon rose 30 feet into the air = +30

6. Images can depict integers as well…

7. What integer represents the planes height
What integer represents the planes height? What about the submarine’s height?

8. Representing INTEGERS (-) or (+)
EX 1:
All of the following situations below can be represented by the integer 18, except which one?
The population increased by 18.
Jon earned $18 by pet sitting
18 gallons of water flowed out of the water tank.
The football team gained 18 yards.

9. Representing INTEGERS (-) or (+)
EX 2:
A company produced 5,000 shoelaces in 5 hours on Monday. On Tuesday, it produced 5,250 shoelaces in 5 hours. Which integer represents the CHANGE in number of shoelaces produced from Monday to Tuesday?
250 25
-25
-250

10. Representing INTEGERS (-) or (+)
EX 3:
A hawk flew up to a height of 46 feet and then dove 18 feet toward the ground. Which integer describes the hawk’s height now? 64 28
-28
-64

11. Representing INTEGERS (-) or (+)
EX 4:
Nicole went snow skiing. When she left the slopes on Saturday, the temperature was ˚. The temperature dropped 11 degrees by the time the sun went down that evening. What was the temperature when the sun went down? 8˚
-8˚
-11˚
-14˚

12. Representing INTEGERS (-) or (+)
EX 5:
A submarine descended 300 feet below sea level and then descended another 800 feet. What is the final depth of the submarine?
1,100 ft
500 ft
-500 ft
-1,100 ft

13. Representing INTEGERS (-) or (+)
EX 6:
At 6 a.m. the temperature was 4˚ below zero. By noon, the temperature had increased 10 degrees. What was the temperature at noon?
- 14˚ 8˚
- 4˚ 6˚

14. Write the Integer Described
1. Sam lost eleven pounds after working out and dieting. 2. Sally found thirty-five seashells on the beach during her vacation. 3. Tom picked twenty-eight limes at the orchard. 4. The stock market dropped forty-one points after the bad economic news yesterday. 5. Fred grew twenty-one watermelons on his farm.

15. Ticket Out
Which of these scenarios is not represented by the integer 15?
Martin found fifteen dollars in the Target parking lot
After 6 hours, Emilio had washed fifteen cars
Cameren used fifteen gallons of gas travelling to Mississippi.
Charlie sold his couch for fifteen dollars more than he paid for it.