The purpose of this activity is for students to practice solving Compare, Difference Unknown story problems (MP2). In the Activity Synthesis, students revisit a representation of a Compare problem that was introduced in a previous unit. This representation lays the foundation for working with tape diagrams in grade 2. 

The teacher may want to incorporate movement into this activity by writing each problem on a piece of chart paper and placing each one in a different location around the classroom. Students can solve the problem at one location, discuss the problem with their partner, then move on to a new problem at a new location. 

• “What did you do to solve the problem?”
• “How could you use the connecting cubes or a drawing to represent the problem?”

• Invite previously identified students to share.
• “How do these representations match the story?”
• If needed, “Where do you see how many fewer stuffed animals there are than toys?”
• If needed, “What equations can we write to represent this problem?”

The purpose of this activity is for students to use given information to ask and answer different questions. Students may ask Put Together or Compare problems using the given information. A representation of the information is also provided. This representation is a precursor to the tape diagrams students will use to represent and solve Compare problems in grade 2.

When students recognize the mathematical features of things in the real world and ask questions that arise from a presented situation, they model with mathematics (MP4).

• Display the representation in the student book. 
• Invite previously identified students to share their question and how the representation helps them find the answer to the question.