Activity Overview
In this activity, students will use the number line to add integers and to justify and support the rules they develop.
Before the Activity
Set up the calculator as explained in the activity
See the attached PDF file for detailed instructions for this activity
Print pages 6 - 11 from the attached PDF file for your class
During the Activity
Distribute the pages to the class.
Follow the Activity procedures:
Use the NUMLINE application and select the number line option that represents the operation of addition
Add two positive integers and observe vectors of the number line
Observe that the sum moves to the right
Predict the vector sketch for addition of zero and a negative integer
Use the calculator and verify the sketch
Add two negative integers and observe the vectors
Understand that addition of negative numbers moves the vectors in the negative direction
Add a positive and negative integer, sketch the prediction and verify using the calculator
Observe that the vectors for addition of positive and negative integers point in opposite directions
After the Activity
Review student results:
As a class, discuss questions that appeared to be more challenging
Re-teach concepts as necessary