# 3. Understanding that multiplication has the same meaning when we put together equal groups of liters, grams, or kilograms. (A)

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.MP3 http://corestandards.org/Math/Practice/MP3
teaches Common Core State Standards CCSS.Math.Practice.MP5 http://corestandards.org/Math/Practice/MP5

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Lesson objective: Apply multiplication to put together equal groups of grams, meters, or liters.

This lesson provides an opportunity for students to apply their knowledge and understanding of multiplication to a mathematical situation. Students are asked to figure out how much weight 3 ants lifted on field day and determine who got 1st, 2nd, and 3rd place.

Key Concept students will use:

• We can use multiplication to solve problems involving measurement quantities (including liquid volumes and masses of objects).

Skills students will use:

• Using arrays for foundations for multiplication (Grade 2, Unit 13)
• Exploring equal groups as a foundation for multiplication and division (Grade 3, Unit 1)
• Understanding the relationship between multiplication and division (Grade 3, Unit 7)
• Developing strategies for multiplication and division (Grade 3, Unit 9)

Students engage in Mathematical Practice 1 (Make sense of problems and persevere in solving them) as students will have to make sense of this problem and persevere in solving it as it is a three-step problem. Students may use number lines, tape diagrams, repeated addition, drawing pictures, equations, or some other strategy to solve.

Key vocabulary:

• equal groups
• multiplication
• number line
• tape diagram

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