Resources and Tools for Elementary Math Specialists and Teachers
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Factor Trees

In this online activity, the learner finds the prime factorization of composite numbers by building factor trees. A second level includes finding the greatest common factor and the least common multiple by sorting factors using a Venn Diagram.
Contributed by: Colleen King, Publisher
Math TopicAlgebraic Thinking, Logic, Number Sense, Basic Operations, Number Concepts, Mathematical Processes
Grade Level4, 5, 6+
Resource TypeActivity

  • Additional Information
    • AudienceLearner
    • LanguageEnglish (USA)
    • Education Topic
    • Interdisciplinary Connection
    • Professional DevelopmentNo
    • ContributorColleen King, Publisher
    • Publication Date2010
    • RightsCopyright@2010
    • AccessFree access
  • Standards
    • Common Core State Standards for Mathematics

      Select a standards document:

  • User Comments
    • 4
      Nice technique employed for GCF and LCM
      By Uncle Bob on 06/21/2012 - 12:02
    • The applet works well. It limits the students making factor trees to no more than 2 factors at a time (i.e. 8 cannot be branched into 2x2x2 in one step). When putting common factors into the Venn diagram intersection, multiple copies are blanked out so that the product of remaining factors is the LCM. The teacher might want to point out that feature as different from what you do with 2 complete prime factorizations to get LCM.