Resources and Tools for Elementary Math Specialists and Teachers
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The Enemy of My Enemy

In this one-page article Steven Strogatz discusses the concept of subtraction, and how we use and make sense of negative numbers. He offers a way to understand why the product of two negative numbers is positive and discusses several real world applications of the concept. The author includes references and notes. This article is part of the author's series on the Elements of Math (menu page cataloged separately).
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Contributed by: The New York Times Company - Publisher, Steven Strogatz - Author
Math TopicNumber Sense, Basic Operations, Number Concepts, Algebraic Thinking, Mathematical Practices, Mathematical Processes
Grade Level3, 4, 5, 6+
Resource TypeReference Materials, Article

  • Additional Information
    • AudienceEducator, General Public
    • LanguageEnglish (USA)
    • Education Topic
    • Interdisciplinary ConnectionScience, Science:Life science:Biology, Social Studies
    • Professional DevelopmentYes
    • ContributorThe New York Times Company - Publisher, Steven Strogatz - Author
    • Publication Date2010-02-14
    • RightsCopyright (c) 2011 The New York Times Company
      http://www.nytco.com/terms_of_use.html
    • AccessFree access
  • Standards
    • Common Core State Standards for Mathematics

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