Definition : A number line is a line representing the set of real numbers ordered from left to right.

InterActivity Directions for InterActivity (opens below interactivity)
Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and active in your browser (Click here to install Java now )

Goal: Identify point on the number line.

1. Click on the New Point button to get a new point on the numberline.

2. What is the value of the purple point on the number line?

3. Input and check your answer!

• Type value in box below. Then click the Check Answer button.

To start over, click on New Point button.

Fractions and Decimals on the Number Line
Roll your mouse over the points to see the corresponding value.

Many thanks to Robert Fant! LFS , Created with SnagIt

Adding and Subtracting with the Number Line Directions for InterActivity (opens below interactivity)
Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and active in your browser (Click here to install Java now )

Goal: See how addition and subtraction of positive and negative numbers works on the number line.

1. Click and drag scale button to get the desired scale on the numberline.

2. Determine 2 grid numbers that you will add or subtract.

3. Click and drag the Add or Subtract toggle to the desired operation.

4. Click and drag the top red arrow to the first number.

5. Click and drag the top blue arrow to the second number.

6. Write down the operation and the result.

7. Select the checkbox to check your result .

Related topics:

Metadata

Global
Cartesian Plane
Brief
Interactivities involving understanding the Cartesian plane coordinate system
Grade
4-10 Interactivities can be used from 4th grade level on up
Strand
Algebra and Functions / Geometry and Measurement
Standard
ACT GR 13-15 , ACT GR 16-19 , ACT GR 20-23
Keywords
numberline, points, ordering, x-coordinate
Comments
none
Download
GeoGebra ? is freeware that can be used offline. After installing GeoGebra , go to the InterActivity and select command: File -> Save . If there is no command menu, just double-click on the InterActivity . It will open in a new window with command menu.
Author
LFS - contact - website
Type
Freeware - Available for Offline and Online Use - Translatable (html)
Use
Requires sunJava player

Robert Fant created a rollover image with Snag-It. Saved as a .swf file and embedded with the swf.php recipe.