# Lesson 13

Use Bar Graphs to Compare

### Lesson Purpose

The purpose of this lesson is for students to make sense of and solve Compare problems using the structure of a bar graph and equations.

### Lesson Narrative

In grade 1, students use the relationship between addition and subtraction to solve and represent Compare problems. They create diagrams and write equations to represent how they think about the quantities within the Compare problems. In this lesson, students interpret bar graphs and use their visual structure to compare quantities. They write equations to represent comparisons and connect these equations to the structure of the bar graph (MP2). In upcoming lessons, students will use bar graphs to make sense of tape diagrams that represent Compare problems.

• Representation
• MLR8

### Learning Goals

Teacher Facing

• Solve Compare problems with an unknown difference within 20.
• Write equations to represent Compare problems.

### Student Facing

• Let’s use bar graphs to solve Compare problems.

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

In future lessons, students will make sense of tape diagrams to represent Compare problems.

How does the work with the bar graphs today help build students’ understanding of this more abstract diagram?

### 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)

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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

### Additional Resources

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