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The Line
The Plane
For Grownups

Graphing Points on a Line

Here is a line:


The arrows at each end show that the line really goes on forever.

Each place on the line is called a point. A few of the points on this line are marked with red dots:


We can number some of the points to make them easier to find. The numbers get bigger from left to right:


Right now, Sam is sitting on point 4:


On this line, only the even numbers are labeled. The other numbers are marked like this: I. This mark is called a tick mark.


If Sam wants to find point 5, what should he do?

    Sam starts at 0,


    and crawls forward. Sam knows that 5 is 1 more than 4, so he counts one tick mark after 4.

    Now Sam is at point 5.


    Sam makes a big green dot to show where he has been. He labels the dot too, so you can tell what it is.


Sam just graphed point 5.


Please send questions, comments, and suggestions
to Ursula Whitcher

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