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ERIC Number: EJ828704
Record Type: Journal
Publication Date: 2008-Dec
Pages: 3
Abstractor: As Provided
Reference Count: 0
ISSN: ISSN-0025-5769
Thoughts on Why (-1)(-1) = +1
Rapke, Tina
Mathematics Teacher, v102 n5 p374-376 Dec 2008
This article considers why (-1)(-1) = +1 and how and why a teacher might go about explaining this concept to high school students without using pseudoreasoning. Furthermore, it provides a precise explanation, through the use of the distributive property, as to why (-1)(-1) = +1. (Contains 1 figure.)
National Council of Teachers of Mathematics. 1906 Association Drive, Reston, VA 20191-1502. Tel: 800-235-7566; Tel: 703-620-3702; Fax: 703-476-2970; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: High Schools
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A