1. 1) 3 + (-5) = 2) -4 + -7 = 3) (+3) + (-4) = 4) 6 + -7 = 5) -5 + -9 =
Warm Up
1) 3 + (-5) =
2) =
3) (+3) + (-4) =
4) =
5) =
6) =
7) =
8) 9 + (-2) =
9) =
10) = -2
-11 -1 -1
-14 -2 7
-10 -4

2. Homework Check
1.) −10 +−7 +−14 2.) −7 +− ) − ) −5 +−9 +−16 5.) − ) 16 +− ) −14 +− ) 13 +− ) 16 +− ) −
-31 1 -6
-30 -2 3
-17 11 20 6

3. Review:
Tell which integer each group of chips represents. +1 -2 +2

4. Write a number sentence for the number line model below.
5 - 8

5. Use fact families.
34 – (-25) = 59
12 – 26 = -14

6. x x Subtracting Integers
Use your red and yellow chips to solve. -8 – (-2) = x x
Once you take away 2 red chips from your 8 red chips, you have 6 red chips left.

7. x x x x -2 - -4 = ? Can you take away 4 red chips?
Use your red and yellow chips to model the following subtraction problem.
= ?
Can you take away 4 red chips?
We have to add enough zero pairs so that you can take away 4 red chips.
Now we can take away 4 red chips. x x x
We have two yellow chips left…
+2 is the answer. x

8. Use your chips to solve. = -2

9. +3 - -5 = +8 Add enough zero pairs so you can take away 5 red chips.
Take away 5 red chips, you have 8 yellow chips left.
= +8

10. Use your chips to solve. = -1

11. = ?
Add two zero pairs so you can take away 2 yellow chips.
Take away 2 yellow chips, you have 5 red chips left.
= -5

12. 3) -5 - +4
= -9
4) -6 - -7
= +1

13. Use your chips to solve the following problems.4
-11 1 -2 7 79
-23
-68 2 39

14. Redefine subtraction:
Subtracting Integers
Redefine subtraction:
To subtract means to add the opposite.

15. Keep the first number as it is. Change the sign to adding
Keep the first number as it is. Change the sign to adding. Change the sign on the second number.

16. (-8) - (15)= (-8) + (- 15)= Now just use the adding rules! -23 Change
Keep
Change
Change
(-8) + (- 15)=
-23
Now just use the adding rules!

17. Practice Problems
17 - (-11) = =
=28

18. (- 21) - (-18)=
- 3
(-21) + 18=

19. What is the difference in temperature between the two thermometers?oC oC 60 60 50 50 40 40 30
20 – (-10) = 30 20 20 = 10 10
-10
-10
-20
-20
-30
-30
30 degrees

20. What is the difference in temperature between the two thermometers?oC oC 60 60 50 50 40 40 30 30
50 – (-15) = 20 20 10 = 10
-10
-10
-20
-20
-30
-30
65 degrees

21. What is the difference in temperature between the two thermometers?oC oC 60 60 50 50 40 40 30 30 20 20 10 10
-15 + (-55)
-10
-10
-20
-20
-30
-30
70 degrees

22. 30 m
25 m
20 m
60m
21m
20m
50m
10m
15m 0m
30m
30m
15m
What is the distance between the helicopter and the anchor?
Calculate the difference in height between the following:
The flock of birds and the sea horse.
The dolphin and the jelly fish.
The jelly fish and the sea horse.
The lobster and the anchor.
The dolphin and the seal:
The boat and the fish.
The helicopter and the lighthouse:
The hot air balloon and the lobster:
6 m
5 m
-5 m
-10m
-15 m
-25 m
-25 m
-30 m

23. Integer Subtraction Rule
Keep, Change, Change!
2 – (-7)
is the same as
2 + (+7)
2 + 7 = 9

24. Solve the following problems.
-12 16 -6 -4 10
-28 -7

25. 14 14 4

26. Homework 2 -2 12 14 -8
-14 8

31. 9 15
Sum
Difference
-11 5
-13 3
-11 9
-15 9
-12 -4
-13 1 -6 4 -9 -5
-15 9

32. 1.05
-1/24
-2.842
8/21
-1/8
-1.18
-1 11/24
-1 3/8