# Lesson 13

Represent Story Problems

### Lesson Purpose

The purpose of this lesson is for students to make connections between different representations of situations for sums and differences.

### Lesson Narrative

In previous lessons, students were introduced to the number line. They learned that numbers are located at points on the line, depending on their distance from zero. They represented addition and subtraction equations with unknowns in all positions on number lines. Students have also used tape diagrams to represent story problems in previous lessons.

In this lesson, students interpret multiple representations and match them to story problems. In the first activity students are not asked to solve the problems. This allows them to focus on how each problem can be represented in different ways, rather than finding the solution. In the second activity, students are given diagrams to complete, but they can find the solution in any way that makes sense to them. They are also given the option to use a number line if it helps.

• Action and Expression
• MLR8

### Learning Goals

Teacher Facing

• Represent addition and subtraction story problems using equations, tape diagrams, and number lines.

### Student Facing

• Let’s compare representations and solve problems.

### Required Materials

Materials to Copy

• Number Line to 100
• Story Problems Card Sort (stories, equations, number lines, diagrams)

### Required Preparation

Activity 1:

• Create a set of cards from the blackline master for each group of 3.

### 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

Which students came up with an unexpected strategy or connection in today’s lesson? What are some ways you can be more open to the ideas of each and every student?

### Suggested Centers

• Number Puzzles: Addition and Subtraction (1–4), Stage 4: Within 100 with Composing (Addressing)
• Number Line Scoot (2–3), Stage 1: Twos, Fives, and Tens (Addressing)