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

Required Preparation

CCSS Standards

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?

Print Formatted Materials

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Student Task Statements pdf docx
Lesson Cover Page pdf docx
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Teacher Presentation Materials pdf docx