# Lesson 5

### Lesson Purpose

The purpose of this lesson is for students to add within 50. Students find the value of sums within 50 in any way that makes sense to them.

### Lesson Narrative

Students added within 100 in grade 1. This lesson serves as a formative assessment of how students find the value of sums with larger addends. Throughout the lesson, monitor for students who look for and make use of the structure of place value to add tens to tens and ones to ones (MP7).

Math Community

Tell students that, at the end of the lesson, they will be asked to reflect on the norms and they can add norms about working with a partner.

• Representation
• MLR8

### Learning Goals

Teacher Facing

• Add within 50 in a way that makes sense to them.

### Student Facing

• Let’s add within 50.

### Required Materials

Materials to Gather

Materials to Copy

• How Close? Stage 3 Recording Sheet

### Required Preparation

Activity 2:

• Create connecting cubes in towers of 10 and singles.

Building On

### 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

In what ways is the math community you are working to foster going well? What actions can you take to continue to build community?

### Suggested Centers

• Number Puzzles: Addition and Subtraction (1–4), Stage 1: Within 10 (Supporting)