Lesson 1.1: Adding Integers with the same sign
The temperature was 2 °F below zero. The temperature drops by 5 °F. What is the temperature now?
-2 + -5 = -7
7 Degrees below zero
10 + ( -18 ) =
-8
-3 - (-4)=
1
-6 + 15 + 15 =
24
1 - (-18) =
19
A football team loses 3 yards on one play
and 6 yards on another play. Write a sum
of negative integers to represent this
situation. Find the sum
-3 + -6 = -9
The team had a loss of 9 yards
A football team gained 9 yards on one play and then lost 19 yards on the next. Write a sum of integers to find the overall change in field position.
9 +(-19) = -10
Loss of 10 yards
At 8 A.M. the temperature was
-14 °F. By noon, the temperature
had dropped 12 °. What is the temperature.
-14-(12) = -26
The temperature is 26 degrees below zero.
9 - 4 - 17 =
-12
-4 + (-7) =
-11
-18 + (-11)
-29
Alexa had a negative balance in her checking account of $47.00. She made a deposit in her account of $47.00. What is the new balance of Alexa’s checking account?
$0
When Iris subtracted -12 - (-12),
she got a difference of -24. Is her
answer correct? If not, what is the correct answer?
No the answer is 0
Jose earned 50 points in a video game. He lost 40 points, earned 87 points, then lost 30 more points. Write and evaluate an expression to find his final score in the video game.
50 - 40 + 87 - 30 = 67 points
5 + (-2) =
3
Select all the expressions that have a value of -5
a. -4 + -1
b. 1 + 4
c. -2 + -3
d. -3 + -2
a. -4 + -1
c. -2 + -3
d. -3 + -2
Select all the expressions that have a value of -5
a. 6 + -1
b. 1 + (-6)
c. -2 + 3
d. -3 + 2
b. 1 + (-6) = -5
The record high January temperature
in Austin, Texas, is 80 °F. The record low
January temperature is -2 °F. Find the
difference between the high and low
temperatures.
80-(-2)= 82
82 degrees
A seal is swimming in the ocean 3 feet below sea level. It dives down 10 feet to catch some fish. Then, the seal swims 10 feet up towards the surface with its catch. What is the seal’s final elevation relative to sea level?
-3 -10 +10 = -3
3 feet below sea level
Cate and Elena were playing a card game. The stack of cards in the middle had 24 cards in it to begin with. Cate added 8 cards to the stack. Elena then took 12 cards from the stack. Finally, Cate took 9 cards from the stack. How many cards were left in the stack?
24 + 8 -12 -9 = 11 cards
Julio is playing a trivia game. On his first turn, he lost 100 points. On his second turn, he lost 25 points. On his third turn, he lost 50 points. Write a sum of three negative integers that models the change to Julio’s score after his first three turns.
-100 + (-25) + (-50) = -175
A bus makes it's first stop of the day at 8:00 am and 15 people get on. At the next stop he lets off 9 people. How many people are on the bus?
15 + (-9) = 6
Look at each expression. Does it have the same value as -6 - 4? Select Yes or No.
A. -6 + (-4) Yes or No
B. -4 + (-6) Yes or No
C. 6 + (-4) Yes or No
A. yes
B. Yes
C. No
At 3:00 a.m., the temperature is –5 °F. Between 3:00 a.m. and 6:00 a.m., the temperature drops by 12 °F. Between 6:00 a.m. and 9:00 a.m., the
temperature rises by 4 °F. What is the temperature at 9:00 a.m.?
-5 - 12 + 4 = -13
13 degrees below zero
Determine which expression has
the greater value:
40 - 16 + 10 or -20 + 18 + 30?
40 - 16 + 10 has the greater value
40 - 16 + 10 = 34 > -20 + 18 + 30 = 28