Lesson 5
Problemas-historia de juntar y separar
Lesson Purpose
The purpose of this lesson is for students to solve Put Together/Take Apart, Addend Unknown story problems.
Lesson Narrative
Students were introduced to, and practiced solving these story problem types in previous units. This lesson provides more practice for students to make sense of and solve these story problems in their own way. As these problems rely on making sense of part-part-whole relationships (MP1), students use the relationship between addition and subtraction (MP7) to solve problems and make sense of their peers' solution methods (MP3).
If students need additional support with the concepts in this lesson, refer back to Unit 2, Section B in the curriculum materials.
- Engagement
- MLR8
Learning Goals
Teacher Facing
- Solve Put Together/Take Apart, Addend Unknown story problems in a way that makes sense to them.
Student Facing
Resolvamos más problemas-historia.
Required Materials
Materials to Gather
Required Preparation
Lesson Timeline
| Warm-up | 10 min |
| Activity 1 | 20 min |
| Activity 2 | 15 min |
| Lesson Synthesis | 10 min |
| Cool-down | 5 min |
Teacher Reflection Questions
What aspects of today’s lesson allowed each of your students to see themselves as productive mathematical reasoners?