Integers Around Us

1
Integers Around Us
Student Sample
2
Where do we see integers in action?
3
Adding Integers in the Real World
The temperature was 5 degrees Fahrenheit at
700 am. It rose 20 degrees Fahrenheit by 200pm.
What was the temperature at 200pm?
-5º 20º 15º
4
Subtracting Integers in The Real World
The football team gained 5 yards on their first
play of the game. Then they lost 6 yards. What
was the change in yardage?
5 yards 6 yards -1 yard
5
Multiplying Integers in Everyday Life
Michael was a contestant on a game show. Every
time he answered incorrectly he lost 200.00.
Michael lost three times. How much money did
Michael lose?
(3)(-200.00) -600.00
6
Dividing Integers in The Real World
The basketball team lost their last 5 games.
They lost by a total of 40 points. What is the
average number of points lost per game?
-40 5 - 8 points per game
7
Adding IntegersThe Rules

• If the signs are different, SUBTRACT
• and take the sign of the higher number
• If the signs are the same, ADD and
• keep the sign

Examples 20 18 38
-20 18 -2 20 (-18)
2 (-20) (-18) -38
8
Subtracting IntegersThe Rules

• Keep the sign of the first number
• Change the subtraction sign to addition
• Change the sign of the second number
• Follow the rules for addition

Examples 15 5 10
15 (-5) 20 -15 5
-20 -15 (-5) -10
9
Multiplying and Dividing IntegersThe Rules Are
The SAME

• If the signs are the same, the answer is POSITIVE
• If the signs are different, the answer is NEGATIVE

Examples 12 6 2 -6 -2 12
-12 6 -2 6 -2 -12