# Lesson 22

Divide Whole Numbers by 0.1 and 0.01

### Lesson Purpose

The purpose of this lesson is for students to notice and explain patterns when dividing a whole number by one tenth and one hundredth.

### Lesson Narrative

In prior lessons, students represented decimals to the thousandths with diagrams, words, numbers, and expressions. They also added, subtracted and multiplied decimals using place value understanding, properties of operations, and relationships between operations. In this lesson, students begin to work with decimals and division. They divide whole numbers by one tenth and one hundredth and notice and explain patterns they observe. Students apply their understanding of division as “how many groups” to hundredths grids where the entire grid represents one whole. This allows them to visualize how many tenths or hundredths are in one or several wholes while also preparing students to find quotients of more complex decimals in future lessons.
• Representation

Activity 1: Patterns in Dividing by Decimal Units

### Learning Goals

Teacher Facing

• Divide whole numbers by one tenth and one hundredth.

### Student Facing

• Let’s divide whole numbers by one tenth and one hundredth.

### Required Materials

Materials to Copy

• Small Grids

Building Towards

### 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

Reflect on how comfortable your students are asking questions of you and of each other. What can you do to encourage students to ask more questions?

### Suggested Centers

• Compare (1–5), Stage 4: Divide within 100 (Supporting)
• Compare (1–5), Stage 6: Add and Subtract Fractions (Supporting)

### Print Formatted Materials

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