Education Technology

Integers! It All Adds Up!

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