Absolute Value and Opposites
What symbols do we use to refer to a number's absolute value?
(-8) + (-1)
-9
-18 - 3
-21
-3 x -8
24
Mrs. Richardson has $71 in her checking account. If she writes a check for $145, what is the balance of her checking account?
-$74
What is the opposite of 15?
-15
49 + (-15)
34
18 - 45
-27
-125/5
-25
An elevator is on the twentieth floor. It goes down 11 floors and then up 5 floors. What floor is the elevator on now?
Floor 14
What is the absolute value of -18?
18
(-7) + 3 + (-9)
-13
37 - (-19)
56
What strategy can we use for multiplying/dividing integers?
Sleepy Cat!
A submarine was situated 800 feet below sea level. If it ascends 250 feet, what is its new position?
-550ft
l42l
42
-247 + 1,048
801
-12 - 7 - (-29)
10
-9 x 2 x (-4)
72
An airplane started at 0 feet. It rose 21,000 feet at takeoff. Then it descended 4,329 feet because of clouds. An oncoming plane was approaching, so it rose 6,333 feet. After the oncoming plane passed, it descended 8,453 feet. What is the altitude of the plane now?
14,551 feet
What is the opposite of l120l?
-120
What strategy can we use for adding integers?
Scoreboard or Good Guys/Bad Guys ("Pew Pews")
What do we have to do to subtraction problems before we can scoreboard them?
Keep-Change-Opposite
-4,905/45
-109
Some number added to -11 is 37. Divide this number by -12. Then, multiply by -8. What is the final number?
32