1. Taking the “minus” out of
Integer Subtraction
Taking the “minus” out of
subtraction

2. IWBAT subtract integers.
Today’s Objective
IWBAT subtract integers.

3. But first, let’s review!

4. The Integer Song
Same signs add and keep Different signs subtract Take the sign of the higher #, Then you’ll be exact!

5. Adding Integers … In Context!
If it were 110 degrees outside on Monday morning, and then got 34 more degrees hotter by noon, what would the new temperature be?
144 degrees
Man, it’s hot!!!

6. Adding Integers … In Context
If it were -5 degrees outside on Monday morning and then got 7 degrees hotter by noon, what would the new temperature be?
-5 + 7
Brrrrr … it’s cold out there!
2 degrees

7. Adding Integers … In Context
Once upon a time, in a far away land of Minnesota … If it were -15 degrees outside on Monday morning and then got 17 more degrees colder by noon, what would the new temperature be?
-32 degrees

8. So what if I see subtraction?
I've got just 3 simple letters for you... K C C

9. But what is
KCC?? K
eep C
hange C
hange

10. Using the KCC subtraction rewritten K C C
Any ______________ problem can be ____________ using the ___ ___ ___.
rewritten K C C
Keep
Change
Change
5 - 7 = 7 + -
(In this case) CHANGE the “positive 7” to a “negative 7.”
KEEP the 5. Don’t do anything to it!
CHANGE the “-” sign to an “+” sign.

11. KCC Solve the following problems using the KCC method. 5 – 12 =
10 – 13 =
14 – 22 =
32 – 33 =
-5 – 12 =
-7 – 11 =
-4 – 12 =
-3 – 24 =

12. EXIT TICKET
Now try these out. Remember, we still use KCC whenever we see subtraction.
5 – (-12) =
10 – (-13) =
14 – (-22) =
32 – (-33) =
-5 – (-12) =
-7 – (-11) =
-4 – (-12) =
-3 – (-24) =