Adding and Subtracting Integers Using a Number Line or Chip Models.

1
Adding and Subtracting Integers Using a Number
Line or Chip Models.

• When it asks for a change the sign in front of
  the numbers needs to indicate which way you are
  changing. A positive change goes from a small
  number to a larger number. A negative change
  goes from a large number to a smaller number.
• A positive (black or yellow) chip and a negative
  (red) chip equal zero, or a zero pair.

2
What is the value?
There are 7 positives and 6 negatives. This
means there are 6 zero pairs that cancel out to
equal zero. The value of this board is positive
1.7 (-6) 1
3
What is the value?
There are 5 positives and 6 negatives. This
means there are 5 zero pairs that cancel out to
equal zero. The value of this board is positive
1.5 (-6) (-1)
4
-10 5 -5
Now you have your answer -5
There are 10 negative chips here.
Cancel out the zero pairs.
Now add 5 positives.
5
4 (-6)
There are no negatives here to subtract, so you
have to add zero pairs.
Now there are six negatives to take away.
Now take the six negatives away.
Now you are left with the answer 10