1. Addition and Subtraction of Integers
Using a number line

2. Objectives be able to add integers using a number line
be able to subtract integers using a number line

3. Adding a positive integer
To use a number line to carry out
start at +2
face the positive direction
move forward three spaces +1 +2 +3 +4 -4 -3 -2 -1 +5 -5
= +5

4. Adding a negative integer
To use a number line to carry out
start at +2
face the positive direction
move backward three spaces +1 +2 +3 +4 -4 -3 -2 -1 +5 -5
= -1

5. Subtracting a positive integer
To use a number line to carry out
start at +5
face the negative direction
move forward three spaces +1 +2 +3 +4 -4 -3 -2 -1 +5 -5
= +2

6. Subtracting a negative integer
To use a number line to carry out
start at +2
face the negative direction
move backwards three spaces +1 +2 +3 +4 -4 -3 -2 -1 +5 -5
= +5