Lesson plan

# 5. Investigate the commutative property with fraction division (A)

teaches Common Core State Standards CCSS.Math.Content.5.NF.B.7 http://corestandards.org/Math/Content/5/NF/B/7
teaches Common Core State Standards CCSS.Math.Practice.MP3 http://corestandards.org/Math/Practice/MP3

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Lesson objective: Connect understanding of the dividend and the divisor in division of fractions.

This lesson provides an opportunity for students to apply their knowledge and understanding of partitive and measurement division to a mathematical situation. Students are asked to make a claim regarding the equality of two expressions and construct an argument to support their reasoning.

Key Concept students will use:

• The relationship of multiplication and division remain the same regardless of the numbers used.

Skills students will use:

• division of a whole number by a unit fraction (Grade 5, Unit 8)
• division of a unit fraction by a whole number (Grade 5, Unit 8)

Students engage in Mathematical Practice 3 (Construct viable arguments and critique the reasoning of others) as they make and defend a claim about the equality of two expressions.

Key vocabulary:

• commutative
• division
• unit fraction