Integer Addition and Subtraction

Integer Addition Rules Rule #1 – If the signs are the same, pretend the signs aren’t there. Add the numbers and then put the sign of the addends in front of your answer = = -14

Integer Addition Rules Rule #2 – If the signs are different pretend the signs aren’t there. Subtract the smaller from the larger and put the sign of the larger in front of your answer = = 4 Larger number Answer = - 4

When adding integers, remember the following pneumonic devices: L A S S U S B

Adding Like Terms (LASS) -6 + (-8) Like signs, so simply Add = 14, and then keep the same sign - Adding Unlike Terms (USB) 6 + (-8) Unlike signs, so Subtract = -2 Then keep the sign of the Bigger number

Solve the Problems = = (+3) + (+4) = = = =

Solve These Problems = = 3 + (-4) = = = =

One Way to Add Integers Is With a Number Line When the number is positive count to the right. When the number is negative count to the left. +-

One Way to Add Integers Is With a Number Line =-2

One Way to Add Integers Is With a Number Line =+2

One Way to Add Integers Is With a Number Line =-4

One Way to Add Integers Is With a Number Line =+6

One Way to Add Integers Is With a Number Line =-3

One Way to Add Integers Is With a Number Line =-6

One Way to Add Integers Is With a Number Line =-5

One Way to Add Integers Is With a Number Line =-5

One Way to Add Integers Is With a Number Line =5

Subtracting Integers When you subtract integers, it’s easy to remember the following: COPY, CHANGE, CHANGE

4 – 9 Copy the first number 4+(-9) Change the minus sign to addition Change the second number to its opposite (sign) Now you are adding unlike signs (USB), so subtract And Keep the sign of the bigger number = 5 -

Practice 2-10 = 3-(-2) = 1-9 = -4 – 2= -22 – (-7) =