Lesson plan

Use inverse operations to understand why zero cannot be a divisor

teaches Common Core State Standards CCSS.Math.Content.7.NS.A.2b http://corestandards.org/Math/Content/7/NS/A/2/b
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2

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Big Ideas: When zero is divided by any non-zero number, the quotient is zero, and zero cannot be a divisor. This lesson builds upon students' previous work with division of rational numbers. In this task, students are introduced to a machine that creates the fact family for a given set of numbers. Students must then find the missing factors to complete each family. When given zero as a factor, students reason why dividing by zero does not produce an answer. The mathematical concepts in this lesson builds towards student's future work with simplifying expressions and solving equations. Special Materials: None