Show:
Model with Chips
Adding Integers
Subtracting Integers
Mix
100

-3 + 4

- - -

++++

1

100
-5 + 9
4
100
-4 - 6
-10
100
-2 - 3
-5
200

-2 + -3

- - 

- - -

-5

200
-12 + 5
-7
200
4 - 11
-7
200
-10 + 30
20
300

3 - 4

+ + +        +

                 -

-1

300
-16 + (-17)
-33
300
15 - (-7)
22
300
21 - (+5)
16
400

-3 - (-1)

- -  take out -

-2

400
How do you find the sum of numbers with different signs
Subtract and take the sign of the bigger number
400
-27 - (-3)
-24
400
Subtracting a negative is the same thing as...
Adding a positive
500

4 - (-1)

+ + + +      +

                  -

5

500
-16+18+-17
-15
500
-10 - 11 - (-3)
-18
500
-10 + (-2) - 5
-17