1. Add and Subtract Negative Numbers

2. + walk forwards - walk backwards
“-2 ADD POSITIVE THREE”
-2 + 3
+ walk forwards - walk backwards 
start here
+ face right - face left 

3. 1 + 1 = 2  +1 “1 ADD POSITIVE ONE” -3 -2 -1 0 1 2 3
ADD – Face POSITIVE
ADD POSITIVE – Walk FORWARDS +1
= 2

4. -2 + 3 = 1  +3 “NEGATIVE TWO ADD POSITIVE THREE” -3 -2 -1 0 1 2 3
ADD – Face POSITIVE
ADD POSITIVE – Walk FORWARDS +3
= 1

5. 1 + -1 = 0  -1 “1 ADD NEGATIVE ONE” -3 -2 -1 0 1 2 3
ADD – Face POSITIVE
ADD NEGATIVE – Walk BACKWARDS -1
= 0

6. 1 - 2 = -1  -2 “1 TAKE AWAY (POSITIVE) TWO” -3 -2 -1 0 1 2 3
TAKE AWAY – Face NEGATIVE
TAKE AWAY POSITIVE – Walk FORWARDS -2
= -1

7. -1 - -2 = 1  -2 “NEGATIVE 1 TAKE AWAY NEGATIVE TWO” -3 -2 -1 0 1 2 3
TAKE AWAY – Face NEGATIVE
TAKE AWAY NEGATIVE – Walk BACKWARDS -2
= 1