# Lesson 15

Diagramas con todo tipo de problemas de comparación

### Lesson Purpose

The purpose of this lesson is for students to connect Compare problems with unknowns in all positions to tape diagrams.

### Lesson Narrative

In this lesson, students continue to make sense of tape diagrams as they connect them to story problems. The story problems in this lesson include Compare problems with an unknown difference, an unknown larger number, or an unknown smaller number. Because these problem types are familiar from grade 1, students also begin to work with numbers within 100 in this lesson. This gives students an opportunity to notice how the tape diagram can be used to quickly visualize story problems with larger quantities. Students use tape diagrams to make sense of Compare problems. When students connect situations, tape diagrams, and equations, they deepen their understanding of the problem type and develop strategies they can use to make sense of and persevere in solving these problems in future lessons (MP1, MP2).

• Action and Expression
• MLR8

### Learning Goals

Teacher Facing

• Interpret tape diagrams that represent Compare problems, with unknowns in all positions within 100.

### Student Facing

• Conectemos problemas de comparación con diagramas.

### Required Materials

Materials to Copy

• Card Sort: At the Beach, Spanish

### Required Preparation

Activity 2:

• Create a set of cards from the blackline master for each group of 2.

Addressing

### 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

As students worked in their small groups today, whose ideas were heard, valued, and accepted? How can you adjust the group structure in future lessons to ensure each student’s ideas are a part of the collective learning?

### Suggested Centers

• Number Puzzles: Addition and Subtraction (1–4), Stage 2: Within 20 (Addressing)
• Shake and Spill (K–2), Stage 5: Cover (up to 20) (Supporting)
• Sort and Display (1–3), Stage 2: Picture or Bar Graphs (Addressing)

### Print Formatted Materials

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 Student Task Statements pdf docx Lesson Cover Page pdf docx Cool Down Log In Teacher Guide Log In Teacher Presentation Materials pdf docx Blackline Masters zip