1. Adding integers with tiles and number lines
Lesson 2.2 and 2.3

2. To add two positive integers: (+3) + (+2)...you can use tiles.
Combine the tiles. There are 5 yellow tiles. They model +5 +2
So, (+3) + (+2) = +5

3. To add two negative integers, you can also use tiles. (-3) + (-4) =
Combine the red tiles. There are 7 tiles. They model -7. -3 -4
So, (-3) + (-4) = -7

4. To add a negative integer and a positive integer, you can use tiles-3
First, find the zero pairs... +5
There are 3 zero pairs.
Count the tiles that are left...there are 3 yellow tiles left. They model +3.
So, (-3) + (+5)= +3

5. The temperature rise +5˚C, then, it falls 8˚C.
A) represent the above statement with integers.
B) Find the overall change in temperature.

6. A) +5 indicates a rise in temperature.
-8 indicates a drop in temperature.
The equation is: (+5) + (-8) =
b) Using tiles to model temperature change: +5 -8
There are 3 red tiles left. That means the answer is -3. So, the overall change in temperature is -3˚C