Unit 1, Lesson 11# Use place value understanding to fluently add multi-digit whole numbers using the standard addition algorithm, and apply the algorithm to solve word problems using tape diagrams

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In this lesson, students represent addition of multi-digit whole numbers initially by drawing place value disks on place value charts and relating these representations to the standard algorithm. The students begin with addition involving one composition and move to adding with multiple compositions. By the end of the lesson, students use only tape diagrams and the standard algorithm to add.