Lesson plan

Subtract within 100 by tens and ones

teaches Common Core State Standards CCSS.Math.Content.2.NBT.B.5 http://corestandards.org/Math/Content/2/NBT/B/5
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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Big Ideas: Numbers can be decomposed many different ways to subtract. This lesson builds on the students' prior knowledge of using the same strategy to add. The task will allow students to model why the strategy works. The task also develops flexible thinking as students choose different ways to model the same problem. Vocabulary: add, subtract, equation, equal, decompose, value, strategy, tens, ones, places Special Materials: Base Ten Blocks Connecting Cubes (optional)