# Lesson 14

Usemos diagramas para comparar

### Lesson Purpose

The purpose of this lesson is for students to use their understanding of bar graphs to interpret tape diagrams and solve Compare problems with the difference unknown within 20.

### Lesson Narrative

In this lesson, students use their understanding of bar graphs to make sense of a new representation, the tape diagram. The tape diagram is a representation that can be used by students to represent story problems. Students will use tape diagrams in grade 2 and throughout elementary, middle, and high school.

• MLR2

Activity 1: Hora de festejar (parte 1)

### Learning Goals

Teacher Facing

• Solve Compare problems with an unknown difference within 20.
• Use understanding of bar graphs to make sense of tape diagrams.

### Student Facing

• Usemos gráficas de barras y diagramas para resolver problemas de comparación.

### Required Materials

Materials to Gather

Materials to Copy

• Party Time, Spanish

Building Towards

### 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

The relationship between addition and subtraction is important as students develop fluency within 20 in grade 2. How did you use the tape diagram to help students build this understanding?

### Suggested Centers

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