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Arithmetic >> Fractions >> Find Greatest Common Factors

Lesson Plan--Adding and Subtracting Fractions--Lesson 2--Review of LCM and GCF

Lesson Plan: Review LCM and GCF 

This second lesson in the Adding and Subtracting Fractions Unit focuses on the essential concepts of Least Common Multiple (LCM) and Greatest Common Factor (GCF). Understanding these concepts is critical for working with fractions, especially when finding common denominators for addition and subtraction.

Students will:

  • Review the definitions and applications of LCM and GCF
  • Use LCM to determine common denominators for fraction operations
  • Apply GCF to simplify fractions after performing operations
  • Practice using these skills in real-world fraction problems

Designed for grades 3-5, this lesson aligns with Common Core standards and builds on prior knowledge of multiplication and division. By mastering LCM and GCF, students will be better prepared for upcoming lessons on adding and subtracting fractions with unlike denominators.

This is the second lesson in a ten-part unit on adding and subtracting fractions. Future lessons will build on these foundational skills to help students confidently perform fraction operations.

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Common Core Standards CCSS.MATH.CONTENT.4.NF.B.3, CCSS.MATH.CONTENT.4.NF.B.4, CCSS.MATH.CONTENT.5.NF.A.1, CCSS.MATH.CONTENT.6.NS.B.4
Grade Range 3 - 5
Curriculum Nodes Arithmetic
    • Fractions
        • Find Greatest Common Factors
Copyright Year 2025
Keywords adding fractions, LCM, gcf