Contents

1. Section A: Odd and Even
2. Lesson 1: Can You Share?
   1. Warm-up: Notice and Wonder: Sharing is Caring
   2. 1.1: My Fair Share
   3. 1.2: Share the Marbles
3. Lesson 2: Partners Make Pairs
   1. Warm-up: Which One Doesn’t Belong: Laundry Day
   2. 2.1: Pair Up
   3. 2.2: Are You Feeling Left Out?
4. Lesson 3: Is it Odd or Even?
   1. 3.1: Color by Number
   2. 3.2: Card Sort: Even or Odd
5. Lesson 4: Decompose Even and Odd Numbers
   1. Warm-up: Number Talk: Equal Addends
   2. 4.1: Share in Different Ways
   3. 4.2: Represent Numbers with Two Addends
   4. Section A Summary
6. Lesson 5: Patterns with Even and Odd Numbers
   1. Warm-up: How Many Do You See: Even or Odd
   2. 5.1: Even and Odd Round-about
   3. 5.2: Presto Chango
7. Lesson 6: Center Day 1
   1. Warm-up: Number Talk: Two More
   2. 6.2: Centers: Choice Time
   3. Section A Practice Problems
8. Section B: Rectangular Arrays
9. Lesson 7: What is an Array?
   1. Warm-up: Which One Doesn’t Belong: Counter Collections
   2. 7.1: What is an Array?
   3. 7.2: Rows of Counters
10. Lesson 8: Count Columns and Objects in Columns
    1. Warm-up: Estimation Exploration: Rearrange the Dots
    2. 8.1: Count by Columns
    3. 8.2: Guess My Array
11. Lesson 9: A Sum of Equal Addends
    1. Warm-up: Estimation Exploration: How Many Waffles?
    2. 9.1: Sums of Rows and Sums of Columns
    3. 9.2: Card Sort: Arrays and Expressions
    4. 9.3: Add It All Up
12. Lesson 10: Write Expressions and Equations to Represent Arrays
    1. Warm-up: True or False: Expressions that Represent Arrays
    2. 10.1: Build Arrays and Write Equations
    3. 10.2: Arrange Veggies to Make Arrays
13. Lesson 11: Arrays and Rectangles
    1. Warm-up: Which One Doesn’t Belong: All Kinds of Arrays
    2. 11.1: Use Tiles to Make Arrays
    3. 11.2: Make Equal-size Squares
14. Lesson 12: Partition Rectangles into Squares
    1. Warm-up: Estimation Exploration: Fill it Up
    2. 12.1: How Many Squares?
    3. 12.2: Partition Rectangles
    4. Section B Summary
15. Lesson 13: Center Day 2
    1. Warm-up: True or False: Two or False
    2. 13.1: Centers: Choice Time
    3. Section B Practice Problems
16. Glossary
17. Attributions
    1. Image Attributions
18. Notes
19. Notes