1. 1
Adding Integers
Pre-Algebra
Unit 2 Lesson 3

2. 2
What is an integer?
Integers: All whole numbers and its opposite
-45
1.25
100
2/5
-12.

3. 3
Adding
+ =apple apple MORE apples
+ =fart fart Dangerous Gasses!
(MORE farts)

4. 4
Adding Integers with the same sign:
Rule: Same sign, add all together, keep sign.
Try these problems with the chips:
2 + 7 =
-3 + -3 =
-5 + -1 =
6 + 4 =

5. 5
Adding Integers with the same sign:
Write out these problems on paper using + and - symbols:
-3 + (-4) = -8 + (-2) = 3 + 7 =
example

6. 6
Adding Integers with different signs:
Rule: Different sign, find difference, take sign
of higher number.
-3 + 9 8 + (-10)
Try these problems with the chips:
5 + (-2) =
-6 + 4 =
(-10) + 10 =

7. 7
Adding Integers with different signs:
Right out these problems on paper using + and - symbols:
7 + (-8) = -4 + 10 = 3 + (-6) =
SMOTD
example

8. 8
Absolute Value: Distance from that number to zero
-1 0-2-3-4-5 1 2 3 4 5
-5 + |-10|

9. 9
Integer Jan Ken Po
(rock paper scissors)

10. 10

11. 11
Subtracting Integers
Unit 2 Lesson 4

12. 12

13. 13
Subtraction = "adding the opposite"
6 - 4 can be seen as... 6 + (-4)
5 - 10 can be seen as... 5 + (-10)
-2 - 7 can be seen as...
-9 - 3 can be seen as...

14. 14
The "-" symbol has three meanings, what are
they?
-
-
-

15. 15
8 - (-7) can be seen as...
-15 - -2 can be seen as...
-4 - - 4 can be seen as...
Do these problems:
5 - - 10
-3 - 8
-7 - - 6