# Contents

1. Section A: Odd and Even
1. Warm-up: Notice and Wonder: Sharing is Caring
2. 1.1: My Fair Share
3. 1.2: Share the Marbles
1. Warm-up: Which One Doesn’t Belong: Laundry Day
2. 2.1: Pair Up
3. 2.2: Are You Feeling Left Out?
1. 3.1: Color by Number
2. 3.2: Card Sort: Even or Odd
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
1. Warm-up: How Many Do You See: Even or Odd
2. 5.1: Even and Odd Round-about
3. 5.2: Presto Chango
1. Warm-up: Number Talk: Two More
2. 6.2: Centers: Choice Time
3. Section A Practice Problems
2. Section B: Rectangular Arrays
1. Warm-up: Which One Doesn’t Belong: Counter Collections
2. 7.1: What is an Array?
3. 7.2: Rows of Counters
1. Warm-up: Estimation Exploration: Rearrange the Dots
2. 8.1: Count by Columns
3. 8.2: Guess My Array
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
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
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
1. Warm-up: Estimation Exploration: Fill it Up
2. 12.1: How Many Squares?
3. 12.2: Partition Rectangles
4. Section B Summary
1. Warm-up: True or False: Two or False
2. 13.1: Centers: Choice Time
3. Section B Practice Problems
3. Glossary