# Contents

1. Section A: What is Division?
1. Warm-up: How Many Do You See: Apples
2. 1.1: How Many Apples?
3. 1.2: Gallery Walk: Apples in Boxes
1. Warm-up: Notice and Wonder: More Apples
2. 2.1: How Many Apples?
3. 2.2: Gallery Walk
4. 2.3: All the Apples
1. Warm-up: Number Talk: The More Things Change...
2. 3.1: Groups of Students
3. 3.2: Elena’s Colored Pencils
4. 3.3: Which Drawing Matches?
1. Warm-up: Number Talk: More or Less?
2. 4.1: Spinning Tops
3. 4.2: Cars in Boxes
4. 4.3: Stacks of Blocks
1. Warm-up: Number Talk: What’s the Same?
2. 5.1: Card Sort: All about Bugs
3. 5.2: Solve a Buggy Problem
4. Section A Summary
5. Section A Practice Problems
2. Section B: Relate Multiplication and Division
1. Warm-up: Notice and Wonder: Missing Numbers
3. 6.2: At the Farmers' Market
1. Warm-up: How Many Do You See: Tens
2. 7.1: Division Round Table
3. 7.2: Sets of School Supplies
1. Warm-up: Number Talk: Multiplication and Division
2. 8.1: Card Sort: Multiplication
3. 8.2: If I Know, Then I Know
1. Warm-up: Notice and Wonder: Multiplication Table
2. 9.1: Products in the Table
3. 9.2: If I Know, Then I Know: Multiplication
1. Warm-up: How Many Do You See: Squares
2. 10.1: From Diagrams to Expressions
3. 10.2: From Expressions to Diagrams
1. Warm-up: Which One Doesn’t Belong: Multiplication in Many Forms
2. 11.1: Mark, then Express
3. 11.2: Card Sort: Different Expressions, Same Rectangle
4. Section B Summary
5. Section B Practice Problems
3. Section C: Multiplying Larger Numbers
1. Warm-up: Notice and Wonder: Tens
2. 12.1: A Whole Lot of Dollars
3. 12.2: Two Strategies
1. Warm-up: Estimation Exploration: Multiply Teens
2. 13.1: Problems with Teen Numbers
3. 13.2: Gallery Walk: Problems with Teen Numbers
1. Warm-up: Notice and Wonder: Seeing Groups
2. 14.1: A Factor Greater than Ten
3. 14.2: Ways to Represent
1. Warm-up: Which One Doesn’t Belong: Rectangles
2. 15.1: Equal Groups, Larger Numbers
3. 15.2: Gallery Walk: Equal Groups, Larger Numbers
1. Warm-up: Number Talk: Three Times Some Numbers
2. 16.1: 4 \times 23 , Represented
3. 16.2: Some Fine Products
4. 16.3: Play Close to 100, Multiplication
1. Warm-up: True or False: Multiply by 10
2. 17.1: Questions about a Situation
3. 17.2: Party Problems
4. Section C Summary
5. Section C Practice Problems
4. Section D: Dividing Larger Numbers
1. Warm-up: What Do You Know About Division?
2. 18.1: Groups on a Field Trip
3. 18.2: Bus Ride and Lunch Groups
1. Warm-up: True or False: Ones, Tens, Twenties
2. 19.1: Divide with Base-Ten Blocks
3. 19.2: Different Ways to Show Division
1. Warm-up: Number Talk: Multiplication and Division
2. 20.1: Ways to Divide
3. 20.2: How Would You Divide?
4. 20.3: Compare, Divide within 100
1. Warm-up: Notice and Wonder: Apples Again