This lesson plan provides the teacher with an activity to help students calculate the Greatest Common Factor of two or more positive integers and develop a definition based on their exploration. Students find the prime factorization of two positive numbers using factor trees and Venn diagrams to sort the prime factors. The plan includes learning objectives, materials needed, questions to ask students, assessment options, extensions, teacher self-reflection questions, and further references.
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Contributed by: Hilary Rose Barron - Author, National Council of Teachers of Mathematics - Publisher

Math TopicLogic, Number Sense, Basic Operations, Number Concepts, Mathematical Practices, Mathematical Processes

Grade Level4, 5, 6+

Resource TypeActivity, Lesson Plans

**Additional Information**- AudienceEducator
- LanguageEnglish (USA)
- Education Topic
- Interdisciplinary Connection
- Professional DevelopmentNo
- ContributorHilary Rose Barron - Author, National Council of Teachers of Mathematics - Publisher
- Publication Date2010
- RightsCopyright (c) 2000 - 2011 National Council of Teachers of Mathematics

http://illuminations.nctm.org/termsofuse.aspx - AccessFree access

**Standards**### Common Core State Standards for Mathematics