Objective: Solve add to with result unknown and put together with result unknown math stories by drawing, writing equations, and making statements of the solution.
In Lesson 9, students solve both add to with result unknown and put together with result unknown problems with their classmates. The lesson begins with a cadre of students engaged in a dance party, and then a number of students join them—how fun! Students then record this action-based problem as an equation, and move on to the put together with result unknown problem type, where they are faced with a set of students whose characteristics invite decomposition, much like in Topic B.
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