# Lesson 9

Resolvamos problemas-historia

### Lesson Purpose

The purpose of this lesson is for students to solve story problems in a way that makes sense to them and to understand how objects and drawings represent a story problem.

### Lesson Narrative

In a previous lesson, students were introduced to story problems with questions. In this lesson, students represent and solve the story problems. They may use objects, math tools, or drawings. Students explain how both objects and drawings show what is happening in a story problem, which will be useful as students create their own representations and interpret other representations in future lessons.

• Representation
• MLR8

Activity 1: Marcadores en la escuela

### Learning Goals

Teacher Facing

• Solve Add To, Result Unknown and Take From, Result Unknown story problems, including problems with a result of 0.

### Student Facing

• Veamos diferentes formas de mostrar lo que ocurrió en un problema-historia.

### Required Materials

Materials to Gather

Materials to Copy

• Math Fingers Stage 3 Recording Sheet

### Required Preparation

Activity 3:

• Gather materials from:
• Math Stories, Stages 1 and 2
• Subtraction Towers, Stage 1
• 5-frames, Stages 1 and 2
• Build Shapes, Stages 1 and 2
• Counting Collections, Stage 1

### Lesson Timeline

 Warm-up 10 min Activity 1 10 min Activity 2 10 min Activity 3 25 min Lesson Synthesis 5 min Cool-down 0 min

### Teacher Reflection Questions

Which students had opportunities to share their work and thinking during whole-class discussion? How did you select these students?