# Lesson 20

Estrategias para dividir

### Lesson Purpose

The purpose of this lesson is for students to analyze representations and strategies for finding quotients with larger numbers and to divide within 100.

### Lesson Narrative

Previously, students use base-ten blocks, diagrams, and other representations or strategies to reason about division within 100. In this lesson, they extend and formalize this work to include writing a series of equations to find the value of a quotient.

In analyzing various strategies to represent division, students reinforce their understanding of place value, properties of operations, and the relationship of multiplication and division.

• Representation
• MLR8

### Learning Goals

Teacher Facing

• Analyze strategies for representing and reasoning about division.
• Divide within 100 using strategies based on place value and properties of operations.

### Student Facing

• Usemos diferentes estrategias para dividir.

### Required Materials

Materials to Gather

Materials to Copy

• Centimeter Grid Paper - Standard
• Compare Stage 4 Division Cards

### Required Preparation

Activity 3:

• Create a set of cards from the blackline master for each group of 2. Remove the cards with two-digit divisors.

### Lesson Timeline

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

### Teacher Reflection Questions

Who has been sharing their ideas in class lately? Make a note of students whose ideas have not been featured in class and look for an opportunity for them to share their thinking in tomorrow’s lesson.

### Suggested Centers

• Compare (1–5), Stage 4: Divide within 100 (Addressing)
• How Close? (1–5), Stage 5: Multiply to 100 (Addressing)
• Can You Draw It? (1–5), Stage 2: Grade 2 Shapes (Supporting)