Lesson plan

9. Using multiplication and division to solve word problems involving measurement (l, g, kg) (FP)

teaches Common Core State Standards CCSS.Math.Content.3.MD.A.2 http://corestandards.org/Math/Content/3/MD/A/2
teaches Common Core State Standards CCSS.Math.Content.3.OA.A.3 http://corestandards.org/Math/Content/3/OA/A/3
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Lesson objective: Multiply and divide with measurement values such as grams, kilograms, and liters.

This lesson helps to build fluency with multiplication and division of measurement values.  Tape diagrams are used here because it supports the idea that multiplication and division are related operations.  This work develops students' understanding that the relationship between multiplication and division sometimes enables us to choose which operation to use; not all problems are either "multiplication problems" or "division problems."

Students engage in Mathematical Practice 7 (Look for and make sure of structure) as they recognize the structure between multiplication and division.  Key strategies are helping students recognize the relationship. Tape diagrams are useful for this as they model both actions well using the same drawing.

Key vocabulary:

• division
• grams (g)
• kilogram (kg)
• liter (L)
• multiplication