1. Chapter 3 Lesson 2
Add Integers

2. Vocab:
opposites
Integers like 2 and -2 are called _____________ because they are the same distance from 0, but on opposite sides. (additive inverses)

3. Add Integers with SAME sign
_________ their absolute values…
The sum is:
Positive if both integers are ______________
Negative if both integers are _______________
Examples:
7 + 4 = (-4) = -11
positive
negative

4. Examples: Find -3 + (-2). -5 Start at 0 Move 3 units down
-3 + (-2) =
Start here at 0 -5

5. Another Example: -43 -26 + (-17)
Both integers are _______________ so the sum is _______________.
-43
negative
negative

6. Your Turn 
-5 + (-7) (-4) (-16)
-12
-14
-30

7. Add integers with DIFFERENT signs
Subtract
_________ their absolute values…
The sum is:
Positive if the ____________ integer’s absolute value is greater.
Negative if the ____________integer’s absolute value is greater.
Examples:
9 + (-4) = = -5
Positives
negatives

8. Examples: Find 5 + (-3). 2 Start at 0.
Move right for positive integers.
Move left for negative integers.
5 + (-3)= 2

9. Try on your own.
6 + (-7) -1 4

10. More Examples:
7 + (-7) (-15) + (-2) -5
-15

11. Your turn…again!
10 + (-12) (-14) + (-6) + 6 -2 5
-14

12. Word Problem
A roller coaster starts at point A. It goes up 20 feet, down 32 feet, and then up 16 feet to point B. Write an addition sentence to find the height at point B in relation to point A. Then find the sum and explain its meaning.
20 + (-32) + 16 4

13. Exit Ticket
-8 + (-4)

14. Homework
Integer chip worksheet