# Contents

1. Section A: Decimals with Tenths and Hundredths
1. Warm-up: Notice and Wonder: Shaded Grid
3. 1.2: Ways to Express a Number
1. Warm-up: True or False: Equivalent Fractions
2. 2.1: Card Sort: Diagrams of Fractions and Decimals
3. 2.2: True or Not True?
1. Warm-up: Which One Doesn’t Belong: Decimals and Fractions
2. 3.1: Points on Number Lines
3. 3.2: Decimals Compared
1. Warm-up: Estimation Exploration
2. 4.1: All in Order
3. 4.2: 400-Meter Dash in a Flash
1. Warm-up: Number Talk: Sums of Fractions
2. 5.1: Order Once, Order Twice
3. 5.2: Long Jumps
4. Section A Summary
5. Section A Practice Problems
2. Section B: Place-value Relationships through 1,000,000
1. Warm-up: What Do You Know about 1,000?
2. 6.1: Build Numbers
3. 6.2: What is 10,000?
1. 7.1: Count and Write Numbers
2. 7.2: Many Thousands
1. Warm-up: How Many Do You See?
2. 8.1: Lin’s Representation
3. 8.2: What Number is Represented?
4. 8.3: Build Hundred-thousands
1. Warm-up: True or False: Expanded Expressions
2. 9.1: Card Sort: Large Numbers
3. 9.2: Expand Large Numbers
1. Warm-up: Number Talk: Related Numbers
2. 10.1: Alike but Not the Same
3. 10.2: More and More Money
1. Warm-up: Estimation Exploration: What Number Could This Be?
2. 11.1: Locate Large Numbers
3. 11.2: So Many Numbers, So Little Line
4. Section B Summary
5. Section B Practice Problems
3. Section C: Compare, Order, and Round
1. Warm-up: Which One Doesn’t Belong: Friendly Numbers
2. 12.1: Which is Greater?
3. 12.2: Incomplete Numbers
4. 12.3: Is It Possible?
1. Warm-up: True or False: Decomposed Numbers
2. 13.1: Ways to Compare
3. 13.2: Video Game Scores
1. 14.1: On Which Line Do They Belong?
2. 14.2: Closer to Some Multiple
1. Warm-up: Estimation Exploration: What Could It Be?
2. 15.1: Closer to This or That?
3. 15.2: Closer to Which Number?
4. 15.3: What’s the Nearest Multiple?
1. Warm-up: Number Talk: Missing Numbers
2. 16.1: Round to What?
3. 16.2: Some Numbers to Round
4. 16.3: Rounded Populations
1. Warm-up: Notice and Wonder: Plane Altitudes
2. 17.1: Apart in the Air
3. 17.2: Safe or Unsafe?
4. 17.3: No-phone Zone?
5. Section C Summary
6. Section C Practice Problems
4. Section D: Add and Subtract
1. Warm-up: Estimation Exploration: What’s the Difference?
2. 18.1: Weekly Steps
3. 18.2: Steps During the Weekend
1. Warm-up: Number Talk: Subtract Fractions
2. 19.1: Find and Check Sums
3. 19.2: Priya’s Family Heirlooms
1. Warm-up: Notice and Wonder: Subtracting Tens of Thousands
2. 20.1: Add and Subtract Large Numbers
3. 20.2: Spot Errors
1. Warm-up: Which One Doesn’t Belong: Numbers with 0, 2, and 5
2. 21.1: What If There is Nothing to Decompose?
3. 21.2: What is Your Age?
1. Warm-up: True or False: Sums and Differences
2. 22.1: The Fundraiser
3. 22.2: The Least and the Greatest of Them All
4. Section D Summary
1. Warm-up: Estimation Exploration: Bees
2. 23.1: Termites, Ants, and Bees
3. 23.2: Bee Population
4. Section D Practice Problems
5. Glossary