Contents

1. Section A: Decimals with Tenths and Hundredths
2. Lesson 1: Decimal Numbers
   1. Warm-up: Notice and Wonder: Shaded Grid
   2. 1.1: Shady Fractions
   3. 1.2: Ways to Express a Number
3. Lesson 2: Equivalent Decimals
   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?
4. Lesson 3: Decimals on Number Lines
   1. Warm-up: Which One Doesn’t Belong: Decimals and Fractions
   2. 3.1: Points on Number Lines
   3. 3.2: Decimals Compared
5. Lesson 4: Compare and Order Decimals
   1. Warm-up: Estimation Exploration
   2. 4.1: All in Order
   3. 4.2: 400-Meter Dash in a Flash
6. Lesson 5: Compare and Order Decimals and Fractions
   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
7. Section B: Place-value Relationships through 1,000,000
8. Lesson 6: How Much is 10,000?
   1. Warm-up: What Do You Know about 1,000?
   2. 6.1: Build Numbers
   3. 6.2: What is 10,000?
9. Lesson 7: Numbers Within 100,000
   1. 7.1: Count and Write Numbers
   2. 7.2: Many Thousands
10. Lesson 8: Beyond 100,000
    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
11. Lesson 9: Same Digit, Different Value
    1. Warm-up: True or False: Expanded Expressions
    2. 9.1: Card Sort: Large Numbers
    3. 9.2: Expand Large Numbers
12. Lesson 10: Ten Times As Much
    1. Warm-up: Number Talk: Related Numbers
    2. 10.1: Alike but Not the Same
    3. 10.2: More and More Money
13. Lesson 11: Large Numbers on a Number Line
    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
14. Section C: Compare, Order, and Round
15. Lesson 12: Compare Multi-digit Numbers
    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?
16. Lesson 13: Order Multi-digit Numbers
    1. Warm-up: True or False: Decomposed Numbers
    2. 13.1: Ways to Compare
    3. 13.2: Video Game Scores
17. Lesson 14: Multiples of 10,000 and 100,000
    1. 14.1: On Which Line Do They Belong?
    2. 14.2: Closer to Some Multiple
18. Lesson 15: The Nearest Multiples of 1,000, 10,000, and 100,000
    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?
19. Lesson 16: Round Numbers
    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
20. Lesson 17: Apply Rounding
    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
21. Section D: Add and Subtract
22. Lesson 18: Standard Algorithm to Add and Subtract
    1. Warm-up: Estimation Exploration: What’s the Difference?
    2. 18.1: Weekly Steps
    3. 18.2: Steps During the Weekend
23. Lesson 19: Compose and Decompose to Add and Subtract
    1. Warm-up: Number Talk: Subtract Fractions
    2. 19.1: Find and Check Sums
    3. 19.2: Priya’s Family Heirlooms
24. Lesson 20: Add and Subtract Within 1,000,000
    1. Warm-up: Notice and Wonder: Subtracting Tens of Thousands
    2. 20.1: Add and Subtract Large Numbers
    3. 20.2: Spot Errors
25. Lesson 21: Zeros in the Standard Algorithm
    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?
26. Lesson 22: Solve Problems Involving Large Numbers
    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
27. Lesson 23: Bees are Buzzing
    1. Warm-up: Estimation Exploration: Bees
    2. 23.1: Termites, Ants, and Bees
    3. 23.2: Bee Population
    4. Section D Practice Problems
28. Glossary
29. Attributions
    1. Image Attributions
30. Citations
31. Notes
32. Notes