# Contents

1. Section A: Develop Fluency with Addition and Subtraction within 10
1. Warm-up: Notice and Wonder: Addition Table
2. 1.1: My Favorite Sum
3. 1.2: Sums I’ve Got
1. Warm-up: Number Talk: 2 or 3 More
2. 2.1: More Shake and Spill
3. 2.2: Are They Both Right?
4. 2.3: Practice Addition within 10
1. Warm-up: How Many Do You See: Sums within 10
2. 3.2: Are Both Sides Equal?
1. Warm-up: True or False: Equal Expressions
2. 4.2: All The Ways To Make 10
3. 4.3: Centers: Choice Time
1. Warm-up: Number Talk: Missing Value Within 10
2. 5.1: Different Ways to Find the Difference
3. 5.2: Subtraction Number Strings
4. 5.3: The Value of the Difference
1. Warm-up: Notice and Wonder: Han's Cup
2. 6.1: A Shake and Spill Story Problem
3. 6.2: Shake and Spill Story Problems
4. Section A Summary
1. 7.2: Centers: Choice Time
2. Section A Practice Problems
2. Section B: Add and Subtract using Ten as a Unit
1. Warm-up: Which One Doesn’t Belong: Groups of 10
2. 8.2: Building Teen Numbers
1. Warm-up: Notice and Wonder: Teen Numbers
2. 9.1: Make It: Teen Numbers and 10-Frames
3. 9.2: Equations With a Ten
1. Warm-up: Number Talk: A Ten and Some Ones
2. 10.1: Story Problems With a Ten
3. 10.2: Related Equations
1. Warm-up: True or False: Teen Numbers
2. 11.1: Rock Collection
3. 11.2: Write Equations: Adding on to Teen Numbers
4. 11.3: Centers: Choice Time
1. 12.1: Noah’s Collection
2. 12.2: Addition and Subtraction Equations with Teen Numbers
1. Warm-up: Number Talk: Add Ones
2. 13.1: Sitting or Standing
3. 13.2: Solve Story Problems and Compare Methods
4. 13.3: Centers: Choice Time
5. Section B Summary
1. Warm-up: True or False: Expressions on Both Sides
2. 14.2: Centers: Choice Time
3. Section B Practice Problems
3. Section C: Add within 20
1. Warm-up: How Many Do You See: 10-frames
2. 15.1: Louis Agassiz Fuertes’s Birds
3. 15.2: Fuertes’s Bird Cards
1. Warm-up: Number Talk: Related Expressions
2. 16.1: Match Expressions
3. 16.2: Is the Equation True?
4. 16.3: Write Expressions
1. Warm-up: How Many Do You See: Double 10-frames
2. 17.1: The 9 Plus Game
3. 17.2: Clare’s Birds
1. Warm-up: How Many Do You See: More Double 10-frames
2. 18.1: Expression Match
3. 18.3: Centers: Choice Time
1. Warm-up: Number Talk: Related Expressions
2. 19.1: Lin, Han, and Kiran Add
3. 19.2: How Did You Add?
1. Warm-up: Number Talk: Using 10 + \boxed{\phantom{4}}
2. 20.1: How Many Reptiles?
3. 20.2: Zoo Exhibits
4. Section C Summary
1. Warm-up: What Do You Know About 20?
2. Section C Practice Problems
4. Section D: Subtract within 20
1. Warm-up: Number Talk: Subtract from a Teen Number
2. 22.1: Subtraction Methods
3. 22.2: Number Card Subtraction
1. Warm-up: Number Talk: Subtract to Make 10
2. 23.1: Number Card Subtraction with 10-frames
3. 23.2: Diego and Andre Find the Difference
1. 24.1: Different Ways to Subtract
2. 24.2: Find the Number That Makes Each Equation True
1. 25.1: Choose Your Own Subtraction Method
2. 25.2: Solve Story Problems
1. Warm-up: Number Talk: Subtract 10 or More
2. 26.1: Solve Related Story Problems
3. 26.2: More Story Problems
4. Section D Summary
1. Warm-up: Number Talk: Subtract 10
2. 27.2: Introduce Compare, Add and Subtract Within 20
1. Warm-up: Notice and Wonder: Counting Things in the Classroom
2. 28.1: Writing Classroom Story Problems
3. 28.3: Poster Gallery Walk
4. Section D Practice Problems
5. Glossary