Resources and Tools for Elementary Math Specialists and Teachers
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Poly Plug Rectangles

This interactive applet reinforces students' knowledge of the properties of rectangles and gives them a game in which to form and test hypotheses. In a 5x5 grid in which a rectangle has been hidden, students try to fix the location with the fewest number of probes (Note: press 'Start' to hide a different rectangle). Ideas for implementation, extension and support are included along with printable sheets and video clips of classroom testing.
4.5
(2 Comments)
Contributed by: Millenium Mathematics Project, Publisher
Math TopicGeometry, Measurement, Number Sense, Number Concepts, Algebraic Thinking, Mathematical Practices, Mathematical Processes
Grade Level1, 2, 3
Resource TypeActivity, Interactive Media

  • Additional Information
    • AudienceLearner
    • LanguageEnglish (United Kingdom), Chinese, Dutch, French, German, Italian, Spanish
    • Education Topic
    • Interdisciplinary Connection
    • Professional DevelopmentNo
    • ContributorMillenium Mathematics Project, Publisher
    • Publication Date2011-09
    • RightsCopyright (c) 2007 University of Cambridge
      http://nrich.maths.org/public/terms.php
    • AccessFree access
  • Standards
    • Common Core State Standards for Mathematics

      Select a standards document:

  • User Comments
    • 4.5
      Simple, and yet...
      By Uncle Bob on 04/17/2012 - 11:03
    • It is surprising how much spatial thinking goes into a simple task when learners are encouraged to use as few guesses as possible. Is a 3x2 arrangement tall or wide? What is the best place to make a first guess ... a next guess? When do I have enough information to be certain?
    • 4.5
      Thanks
      By sai on 07/28/2016 - 06:51
    • Thanks