Lesson plan

Add within 20 by decomposing to make 10

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teaches Common Core State Standards 2.OA.B.2 http://corestandards.org/Math/Content/2/OA/B/2
teaches Common Core State Standards MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards MP7 http://corestandards.org/Math/Practice/MP7
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This lesson builds on students' prior knowledge of combinations of ten. Students will add within 20 by decomposing to make 10. The task challenges students to add by decomposed and recombined to make a ten as an addition strategy. The big idea focuses on finding solutions multiple ways and decomposing and recombining numbers as strategies to add. Vocabulary: tens, ones, decompose, recompose, digit, sum, equal, combination, ten frame Special Materials: Crayons Connecting Cubes (optional)