Lesson plan

# 3. More fluency practice with addition strategies (FP)

teaches Common Core State Standards CCSS.Math.Content.K.OA.A.2 http://corestandards.org/Math/Content/K/OA/A/2
teaches Common Core State Standards CCSS.Math.Content.K.OA.A.5 http://corestandards.org/Math/Content/K/OA/A/5
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Lesson objective: Add by composing and decomposing 10.

This lesson helps to build procedural skill with composing and decomposing 10.  An arithmetic rack  is used here because it highlights the total 10, both visually and kinesthetically. This work develops students' understanding that addition can be thought of as putting together and counting on.

Students engage in Mathematical Practice 1 (Make sense of problems and persevere in solving them) as they use an arithmetic rack to solve problems, thinking of addition as putting together and counting on.

Key vocabulary:

• arithmetic rack
• number partners

Special materials needed:

• arithmetic rack
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• 3. More fluency practice with addition strategies (FP)