The purpose of this activity is to sort story problems into categories students choose. Students may sort the problems based on whether they are one-step problems or two-step problems. They may also use addition, subtraction, or both addition and subtraction as their categories. This sorting process may create some ambiguity since students might sort based on the operation suggested by the overall story structure or by the operation they would use to solve the problem. Some of the two-step stories may require both operations to solve. If students use the operations to sort and sort in different ways, this provides a good opportunity for discussion.

This sorting task gives students opportunities to analyze story problems closely and make connections (MP7). The goal of the Activity Synthesis is to share the different characteristics students used to sort the problems.

• Invite previously selected students to share the categories for their sorts.
• Record the various categories.
• “¿Qué observan acerca de las distintas maneras en las que clasificamos las tarjetas? ¿En qué se parecen? ¿En qué son diferentes?” // “What do you notice about the different ways we sorted the cards? How are they the same? How are they different?” (There are some categories that are about how many steps it takes to solve the problem. Some categories are about what's going on in the problem, like if it is comparing or not. Some categories are about whether the story is about addition or subtraction. Some people used addition and subtraction as categories, but used different cards.)
• If students do not sort in any of the ways suggested in the Student Responses, propose these categories and ask students to use them to sort.

The purpose of this activity is to solve the story problems from the first activity. Monitor for the different ways students represent their thinking and solve their selected problems.
Examples:

• Use tape diagrams to make sense of the problems.
• Draw base-ten diagrams.
• Write equations.

The goal of the Activity Synthesis is to share the different methods students used to make sense of and solve story problems (MP2).

• Invite selected students to share their solutions for the story with Jada’s books in stacks of 10.
• “¿En qué se parecen estos métodos? ¿En qué son diferentes?” // “How are their methods the same? How are they different?”