1. Adding and Subtracting Integers
TransMath

2. To become familiar with adding and subtracting integers, please refer to this video:

3. Learning Objective
Students will learn to add and subtract integers using a variety of strategies.

4. What is an integer?
An integer is a whole number (not a fractional number) that can be positive, negative, or zero. Examples of integers are: -5, 1, 5, 8, 97, and 3,043 .

5. Using a Number Line
When using a number line to add or subtract integers:
Add a positive integer by moving to the right on the number line
Add a negative integer by moving to the left on the number line
Subtract an integer by adding its opposite

6. Rules For Adding Integers
Adding Rules: Positive + Positive = Positive: = 9  Negative + Negative = Negative: (- 7) + (- 2) = - 9
Sum of a negative and a positive number: Use the sign of the larger number and subtract
(- 7) + 4 = (-9) = - 3  (- 3) + 7 = ( -3) = 2

7. Rules For Subtracting Integers
Subtracting Rules: Negative - Positive = Negative: (- 5) - 3 = -5 + (-3) = -8 Positive - Negative = Positive + Positive = Positive: 5 - (-3) = = 8  Negative - Negative = Negative + Positive = Use the sign of the larger number and subtract(Change double negatives to a positive) (-5) - (-3) = ( -5) + 3 = -2 (-3) - ( -5) = (-3) + 5 = 2