1. Objective: Learn to subtract integers.
Subtracting Integers
Objective:
Learn to subtract integers.

2. When subtracting integers:
When you have two negative numbers shown like this: -7 – 8
You have to follow the addition rules as if they were two negative numbers and change as follows: -7 + (-8) = -15
For example: =
Again we will follow the addition rules and
change it as follows… -6 + (-7)= -13
Example: – 10 – 7 =

3. Another way you might see subtracting integers is as follows…
Ex = you must change it as follows:
6 + (-15)=
So you have a positive and a negative number.
Follow the addition rules:
When adding a positive and negative number you must SUBTRACT and the answer takes the sign of the larger number.
So the answer is – 9
Your example: 12 – 26 =

4. For example: 1 – (– 2) = When you subtract a negative number…
Watch out! Whenever you see 2 negative signs together, you must turn them both into positives! For Ex. - (- a ) = + a
When you subtract a negative number…
For example: 1 – (– 2) =
You must change the subtraction to an addition and the negative to a positive…
Like this: 1 + (+2) = 3
Example 1: – (- 19) =
Example 2: – (- 42) =

5. Summary Adding and Subtracting Integers
or = subtract and…
the answer takes the sign of the larger number.
4.When you see 2 negative signs together, with no number in the middle….you must turn them BOTH into positive!! - (- ) (+ )

6. Homework: Solve. Follow the adding and subtracting integer rules.