Unit 1, Lesson 8# Adding a 2-digit number and a 1-digit number by using number strings to decompose numbers and make ten

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Students are going to use what we know about decomposing to learn something new - number strings. Students will learn how to use number strings when we decompose to add a 2-digit number and a 1-digit number. Direct Students to the Mathematical Practices chart on which the practices to be of particular importance for this lesson have been identified using highlighter tape.