# Lesson 4

Encontremos todas las maneras (optional)

### Lesson Purpose

The purpose of this lesson is for students to find all the ways to decompose a number.

### Lesson Narrative

This lesson is optional because finding all of the ways to decompose a number is not an expectation of the kindergarten standards. Students look for and make use of structure (MP7) as they use the patterns in decompositions to help them find all the possible ways to decompose a number.

• Engagement
• MLR8

### Learning Goals

Teacher Facing

• Compose and decompose numbers up to 9.
• Find all the ways to decompose a number.

### Student Facing

• Encontremos todas las maneras de separar un número.

### Required Materials

Materials to Gather

### Required Preparation

Activity 3:

• Gather materials from:
• What’s Behind My Back?, Stage 1
• Check It Off, Stage 1
• Find the Value of Expressions, Stage 1
• Bingo, Stages 1–3
• Shake and Spill, Stages 1–3

### Lesson Timeline

 Warm-up 10 min Activity 1 10 min Activity 2 15 min Activity 3 20 min Lesson Synthesis 5 min Cool-down 0 min

### Teacher Reflection Questions

What part of the lesson went well today in terms of students’ learning? What did you do that made that part go well?