# Meet Mrs. Rowe

## Background

## Mrs. Rowe's "Theorem"

## Working with Subtracting Integers.

What does KFC mean?

K Keep it

F Flip to add

C Change the sign

When students apply the KFC rule, they can easily work with subtracting both positive and negative numbers. Let's take a look:

-3 - 5 is the same as -3 (Keep it) + (Flip to add) -5 (Change the sign). So that's -3 + -5. When signs are the same, you add and keep signs. Answer is -8!

Another example:

3-5. So that's 3 (Keep it) + (Flip to add) -5 (Change sign). So that's 3+-5. Since signs are different, find the difference and sign is largest absolute value. Answer is -2!

One final example:

-3 - -5. -3 (Keep it) + (Flip to add) 5 (Change sign). That is now -3 + 5. Signs are different so find the difference and sign is largest absolute value. Answer is 2!

## Real World Applications

Temperature. Temperature was 15 degrees at noon and dropped 20 degrees by 6:00PM. 15-20 is 15 + -20. Temperature at 6:00PM was -5 degrees.