Adding and Subtracting Integers

Adding and Subtracting Integers

by Christopher Pickett

Open Ended

List anything you already know about adding or subtracting integers

​Adding Integer Rules

​Different than multiplying!!!!

​

​Same signs: add and keep the sign

​

​Different signs: find the difference and keep the sign of the larger number

Multiple Choice

-5 + (-5)

• 10

• 0

• -10

Multiple Choice

-10 + 15

• -25

• 25

• 5

• -5

Multiple Choice

-9 + (-3)

• 6

• -6

• 12

• -12

Multiple Choice

-5 + 6

• 11

• -11

• 1

• -1

​Subtracting Integers

​Change to addition problems using KCF

Open Ended

What is KCF?

​KCF

​Keep It: Keep the first number

​

​Change it: Change the Subtraction to Addition

​

​Flip It: Flip the second number to it's opposite

​

​5 - (-10) will turn to:

​K C F

​5 + 10 = 15

​After using KCF, we use the same addition rules:

​

​If the signs are the same: add and keep the sign

​

​If the signs are different: find the difference and keep the sign of the larger number

Multiple Choice

5 - (-15)

• 20

• 5

• 10

• 15

Multiple Choice

10 - 11

• -1

• 1

• 9

• 21

Multiple Choice

-5 - 5

• 0

• -10

• 1

• 10

​Adding Integer Rules

​Different than multiplying!!!!

​

​Same signs: add and keep the sign

​

​Different signs: find the difference and keep the sign of the larger number

​Subtracting Integers

​Change to addition problems using KCF

​

​Same Addition Rules apply

​

Open Ended

Do you feel like this helped refresh your memory on adding and subtracting i