Subtracting Integers

R-65 Subtraction

What are all the types of subtraction problems that we will need to test? ex. for addition its +/+, -/-, +/- 


Must Build and draw first. 

10-3=
2-7=
3-10=
7-2=
9-4=
4-9=

What is the difference between subtraction and cancelling out (zeroation) 

subtraction- taking away
Cancelling-there needs to be a match between a positive and a negative 

Why can I cancel out a positive and negative? But not a positive and positive or negative and negative? 

-They are opposites. They are the same distance away from zero with the same absolute value. They have the same absolute value of zero.