Lesson 13

The purpose of this lesson is for students to make sense of equations and connect them to the quantities in different types of story problems. Students solve story problems of different problem types within 100 that require composing or decomposing a ten.

In previous lessons, students interpreted different types of story problems and matched them to diagrams.

In this lesson, students continue to connect story problems to diagrams and use their work to make sense of equations and symbols that represent the unknown number (MP2). Students solve different types of story problems within 100 using methods that make the most sense to them.

• Create a set of cards from the blackline master for each group of 2–4.
• Each group of 2–4 needs a set of cards from the previous lesson.

Students shared how they were thinking about using equations throughout today’s lesson. What language did students use to make connections between their equations and the story context? What questions did students have for their peers about the equations they used?