1. Big Ideas: Lesson 1.3
Subtracting Integers

2. Instead of Subtracting…
Change the subtraction to addition and change the sign of the next number

3. KFC
K-Keep the first term
F- Flip the subtraction to addition
C-Change the sign of second term

4. Row Row Row Your Boat Song
Same sign add and keep
Different Sign Subtract
Keep the sign of the larger number
then you’ll be exact
Change the minus to a plus;
Change the sign of the next;
All you do is add them up as if they were a plus

5. Adding and Subtracting Integers

6. Examples:

7. Examples:

8. Examples:

9. Examples:
Monday’s high temperature was 6 degrees Celsius. The low temperature was – 3 degrees Celsius. What was the difference between the high and low temperature?
What is the key word that tells you to subtract?
Difference
Set up your subtraction problem:
6 - (-3)
Turn it into an addition problem:
6 + 3
Simplify:
9 degree difference

10. Video: Subtracting Integers PBS

11. Big Ideas: Page 18 (4-32) even
Homework
Big Ideas: Page 18 (4-32) even