# Number Line

Pronunciation: /ˈnʌm bər laɪn/ Explain

 Figure 1: Number line from -10 to 10 by ones.

A number line is a line with tick marks and numbers that is used to represent the set of real number.[1] The number line in figure 1 shows all real numbers between -10 and 10. You can use other scales with number lines. The number line in figure 2 uses a scale of 10, meaning that the distance between tick marks represents 10 more.

 Figure 2: Number line from -100 to 100 by tens.

The number line in figure 3 uses a scale of 1/10.

 Figure 3: Number line from -100 to 100 by tens.

### NASA Treasures - Coordinate System (Flash video)

For more information on this video, see NASA Connect - HT - Coordinate System (5/19/2005).

### References

1. Bettinger, Alvin K. and Englund, John A.. Algebra and Trigonometry. pp 6-7. www.archive.org. International Textbook Company. January 1963. Last Accessed 1/12/2010. http://www.archive.org/stream/algebraandtrigon033520mbp#page/n18/mode/1up. Buy the book

McAdams, David E. Number Line. 8/7/2018. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/n/numberline.html.

### Revision History

2/25/2008: Removed reference to broken HTML. (McAdams, David E.)
7/12/2007: Initial version. (McAdams, David E.)

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