1. What two numbers will give you a product of 64 and a quotient of 4?
Brain Teaser
What two numbers will give you a product of 64 and a quotient of 4?

2. Solution
16 and 4
16 x 4 = 64
16 ÷ 4 = 4

3. Adding Integers
Lesson 3-2

4. Adding Integers
We can use positive and negative counters to model the addition of integers.
Positive Integer
Negative Integer
A positive integer paired with a negative integer form a zero pair. The value of a zero pair is 0.

5. Add -2 + (-4)
= -6

6. Add 5 + 6
= 11

7. Add -3 + (-5)
= -8

8. Add
= -5

9. Adding Integers with like signs.
Do you notice a pattern or rule?
Adding Integers with like signs.
- When the signs are the same, add the numbers together and keep the sign.

10. = -2
Add
Remove all the zero pairs.

11. = 3
Add 4 + (-1)
Remove all the zero pairs.

12. = -1
Add
Remove all the zero pairs.

13. = -4
Add 3 + (-7)
Remove all the zero pairs.

14. Did you notice a pattern or rule?
Adding integers with unlike signs.
- When the signs are different, subtract the integers and keep the sign of the larger digit.

15. Let’s try a few examples using the rules for adding integers.
-20 -6 12 -2
-38 13
1) =
2) =
3) (-19) =
4) =
5) =
6) (-16) =
7) (-5) =

16. Summary Adding Integers with like signs.
- When the signs are the same, add the numbers together and keep the sign.
= -12
Adding integers with unlike signs.
- When the signs are different, subtract the integers and keep the sign of the larger integer.
= -6