In the previous unit, students made sense of and solved Add To, Result and Change Unknown; Take From, Result Unknown; Put Together, Addend or Result Unknown; and Compare, Difference Unknown story problems. They wrote equations with a box around the answer to the problem.

In this lesson, students are introduced to Add To, Start Unknown story problems. Then students make sense of a variety of types of story problems, solve the problems, and write equations to represent each (MP1). Students apply what they have learned about the structure of adding within 10 to solve these problems (MP7). When students connect the quantities in the story problem to an equation, they reason abstractly and quantitatively (MP2).

How effective were your questions in supporting students’ thinking today? What did students say or do that showed they were effective?