Unit 2, Lesson 12
Story Problems and Diagrams
Grade 2
Preparation
Lesson Narrative
In previous lessons, students solved different story problems within 50 and compared different diagrams and methods. Students interpreted and used tape diagrams to represent Compare story problems.
The problems in this lesson include some of the more challenging types, such as Add To, Start Unknown. Students are introduced to tape diagrams as a way to represent the known and unknown quantities in Add To and Put Together/Take Apart problem types. Students are encouraged to find the unknown values in the way that makes the most sense to them. Students have opportunities to practice composing and decomposing a ten when using strategies based on adding or subtracting by place.
- Engagement
None
- Match (orally and in writing) Compare or Put Together/Take Apart problems and tape diagrams that represent the same relationships.
- Represent and solve story problems within 100.
- Let’s make sense of diagrams and solve story problems.
Required Preparation
- Create a set of cards from the blackline master for each group of 2.
- The sets of cards will be used again in the next lesson.
Teacher Reflection Questions
How does matching the story problems to tape diagrams help students understand the relationship between the known and unknown quantities in a story problem? How will the work of today’s lesson help students interpret and use equations to represent story problems?