Contents

1. Section A: What is Division?
2. Lesson 1: How Many Groups?
   1. Warm-up: How Many Do You See: Apples
   2. 1.1: How Many Apples?
   3. 1.2: Gallery Walk: Apples in Boxes
3. Lesson 2: How Many in Each Group?
   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
4. Lesson 3: Division Situation Drawings
   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?
5. Lesson 4: Interpret Division Expressions
   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
6. Lesson 5: Write Division Expressions
   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
7. Section B: Relate Multiplication and Division
8. Lesson 6: Division as an Unknown Factor
   1. Warm-up: Notice and Wonder: Missing Numbers
   2. 6.1: Equations about Onions
   3. 6.2: At the Farmers' Market
9. Lesson 7: Relate Multiplication and Division
   1. Warm-up: How Many Do You See: Tens
   2. 7.1: Division Round Table
   3. 7.2: Sets of School Supplies
10. Lesson 8: Relate Quotients to Familiar Products
    1. Warm-up: Number Talk: Multiplication and Division
    2. 8.1: Card Sort: Multiplication
    3. 8.2: If I Know, Then I Know
11. Lesson 9: Patterns in the Multiplication Table
    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
12. Lesson 10: Explore Multiplication Strategies with Rectangles
    1. Warm-up: How Many Do You See: Squares
    2. 10.1: From Diagrams to Expressions
    3. 10.2: From Expressions to Diagrams
13. Lesson 11: Multiplication Strategies on Ungridded Rectangles
    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
14. Section C: Multiplying Larger Numbers
15. Lesson 12: Multiply Multiples of Ten
    1. Warm-up: Notice and Wonder: Tens
    2. 12.1: A Whole Lot of Dollars
    3. 12.2: Two Strategies
16. Lesson 13: Solve Problems With Equal Groups
    1. Warm-up: Estimation Exploration: Multiply Teens
    2. 13.1: Problems with Teen Numbers
    3. 13.2: Gallery Walk: Problems with Teen Numbers
17. Lesson 14: Ways to Represent Multiplication of Teen Numbers
    1. Warm-up: Notice and Wonder: Seeing Groups
    2. 14.1: A Factor Greater than Ten
    3. 14.2: Ways to Represent
18. Lesson 15: Equal Groups, Larger Numbers
    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
19. Lesson 16: Multiply Numbers Larger than 20
    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
20. Lesson 17: Use the Four Operations to Solve Problems
    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
21. Section D: Dividing Larger Numbers
22. Lesson 18: Larger Numbers in Equal Groups
    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
23. Lesson 19: Ways to Divide Larger Numbers
    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
24. Lesson 20: Strategies for Dividing
    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
25. Lesson 21: Solve Problems Using the Four Operations
    1. Warm-up: Notice and Wonder: Apples Again
    2. 21.1: Apple Adventure
    3. 21.2: Apple Days
    4. Section D Summary
26. Lesson 22: School Community Garden
    1. Warm-up: Notice and Wonder: Garden
    2. 22.1: Produce
    3. 22.2: Plan the Garden
    4. Section D Practice Problems
27. Glossary
28. Attributions
    1. Image Attributions
29. Notes
30. Notes