Resources and Tools for Elementary Math Specialists and Teachers
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Comparison Estimator

This interactive Java applet allows users to explore estimating numbers of objects, length, and area, by displaying two sets of random shapes, lines, or irregular figures on the screen. Users are asked if the first set is more or less than the second set. Options include: two difficulty levels; displaying guess history; a hint button; and an optional scoring feature that allows users to keep track of the number correct.
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Contributed by: Shodor, Publisher
Math TopicMeasurement, Number Sense, Mathematical Practices, Mathematical Processes
Grade Level2, 3, 4, 5
Resource TypeInteractive Media, Problem Set

  • Additional Information
    • AudienceEducator, Learner
    • LanguageEnglish (USA)
    • Education Topic
    • Interdisciplinary Connection
    • Professional DevelopmentNo
    • ContributorShodor, Publisher
    • Publication Date2002
    • RightsCreative Commons Attribution-NonCommercial 3.0 Unported License
      http://www.shodor.org/interactivate/licensing
    • AccessFree access
  • Standards
    • Common Core State Standards for Mathematics

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