- Section A: Odd and Even
- Warm-up: Notice and Wonder: Sharing is Caring
- 1.1: My Fair Share
- 1.2: Share the Marbles

- Warm-up: Which One Doesn’t Belong: Laundry Day
- 2.1: Pair Up
- 2.2: Are You Feeling Left Out?

- 3.1: Color by Number
- 3.2: Card Sort: Even or Odd

- Warm-up: Number Talk: Equal Addends
- 4.1: Share in Different Ways
- 4.2: Represent Numbers with Two Addends
- Section A Summary

- Warm-up: How Many Do You See: Even or Odd
- 5.1: Even and Odd Round-about
- 5.2: Presto Chango

- Warm-up: Number Talk: Two More
- 6.2: Centers: Choice Time
- Section A Practice Problems

- Section B: Rectangular Arrays
- Warm-up: Which One Doesn’t Belong: Counter Collections
- 7.1: What is an Array?
- 7.2: Rows of Counters

- Warm-up: Estimation Exploration: Rearrange the Dots
- 8.1: Count by Columns
- 8.2: Guess My Array

- Warm-up: Estimation Exploration: How Many Waffles?
- 9.1: Sums of Rows and Sums of Columns
- 9.2: Card Sort: Arrays and Expressions
- 9.3: Add It All Up

- Warm-up: True or False: Expressions that Represent Arrays
- 10.1: Build Arrays and Write Equations
- 10.2: Arrange Veggies to Make Arrays

- Warm-up: Which One Doesn’t Belong: All Kinds of Arrays
- 11.1: Use Tiles to Make Arrays
- 11.2: Make Equal-size Squares

- Warm-up: Estimation Exploration: Fill it Up
- 12.1: How Many Squares?
- 12.2: Partition Rectangles
- Section B Summary

- Warm-up: True or False: Two or False
- 13.1: Centers: Choice Time
- Section B Practice Problems

- Glossary
- Image Attributions

- Notes
- Notes