# Lesson 13

Problemas-historia y ecuaciones

### Lesson Purpose

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.

### Lesson Narrative

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.

- Representation

- MLR8

### Learning Goals

Teacher Facing

- Make sense of equations that represent story problems.
- Represent and solve one-step story problems within 100.

### Student Facing

- Demos sentido a ecuaciones y resolvamos problemas-historia.

### Required Materials

Materials to Gather

Materials to Copy

- Equations for Different Types of Word Problems

### Required Preparation

Activity 1:

- 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.

### Lesson Timeline

Warm-up | 10 min |

Activity 1 | 15 min |

Activity 2 | 20 min |

Lesson Synthesis | 10 min |

Cool-down | 5 min |

### Teacher Reflection Questions

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?

### Suggested Centers

- Target Numbers (1–5), Stage 5: Subtract Two-digit Numbers (Addressing)
- Capture Squares (1–3), Stage 4: Subtract within 20 (Addressing)
- Math Stories (K–2), Stage 4: Add and Subtract (Supporting)

### Print Formatted Materials

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Student Task Statements | docx | |

Lesson Cover Page | docx | |

Cool Down | Log In | |

Teacher Guide | Log In | |

Teacher Presentation Materials | docx | |

Blackline Masters | zip |