Equal Sign

Pronunciation: /ˈikwəl saɪn/ Explain

The equal sign is the symbol '='.[3] The equal sign is used to indicate that the expressions on each side of the equal sign have exactly the same value.

The equation 3 + x = 2x states that the expression 3 + x has the same value as the expression 2x. This equality relationship can be used to conclude that x = 3.


  1. McAdams, David E.. All Math Words Dictionary, equal sign. 2nd Classroom edition 20150108-4799968. pg 71. Life is a Story Problem LLC. January 8, 2015. Buy the book
  2. equal sign. merriam-webster.com. Encyclopedia Britannica. Merriam-Webster. Last Accessed 7/9/2018. http://www.merriam-webster.com/dictionary/equal sign. Buy the book
  3. Keigwin, H. W.. Principles of Elementary Algebra. pg 5. www.archive.org. Ginn & Company. 1886. Last Accessed 7/9/2018. http://www.archive.org/stream/principlesofelem00dupurich#page/5/mode/1up/search/equality. Buy the book

Cite this article as:

McAdams, David E. Equal Sign. 4/20/2019. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/e/equalsign.html.

Revision History

4/20/2019: Updated expressions and equations to match new format. (McAdams, David E.)
12/21/2018: Reviewed and corrected IPA pronunication. (McAdams, David E.)
7/5/2018: Removed broken links, updated license, implemented new markup, implemented new Geogebra protocol. (McAdams, David E.)
1/25/2010: Added "References". (McAdams, David E.)
7/15/2008: Minor clarification edits. (McAdams, David E.)
2/4/2008: Corrected spelling error and changed javascript keyword to href. (McAdams, David E.)
8/2/2007: Initial version. (McAdams, David E.)

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