Lesson 14

The purpose of this lesson is for students to represent and solve one- and two-step story problems. Students use representations to make sense of problems, support their calculations, and explain their thinking.

In previous lessons, students solved different problem types within 100. Students made sense of story problems and connected story problems to diagrams and equations. The activities in this lesson can be used to assess the methods students use to make sense of and solve story problems on their own. Students are introduced to the idea that story problems could have more than one step. In the first activity, students solve a Put Together / Take Apart, Result Unknown problem that includes three addends. Students are presented the story in two separate parts.  In the second activity, students work in groups to solve related story problems on their own and then work together to solve a two-step Put Together / Take Apart problem.

Think about times when students were able to make connections to and build on the ideas of their peers during discussions today. What norms or routines allowed students to engage with other students’ ideas?