# Contents

1. Section A: Numbers to Thousandths
1. Warm-up: Estimation Exploration: One Tiny Piece
2. 1.1: What Do You Know About Thousandths?
3. 1.2: Represent Numbers on a Hundredths Grid
1. Warm-up: Estimation Exploration: What Part of the Square is Shaded?
2. 2.1: Represent Thousandths on a Grid
3. 2.2: Say What?
1. Warm-up: Which One Doesn't Belong: Different Ways to Express a Decimal Number
2. 3.1: Expanded Form
3. 3.2: Decimal Numbers in Numerous Ways
1. Warm-up: Notice and Wonder: Maintain Your Balance
2. 4.1: Balance the Weight
3. 4.2: Weights and Place Values
4. 4.3: Comparing Place Values with Weights
1. Warm-up: True or False: Decimals
2. 5.1: Farther and Faster
3. 5.2: Farthest Frisbee Flight
1. Warm-up: Notice and Wonder: Nested Lines
2. 6.1: Locate 1 Thousandth
3. 6.2: Label and Compare Decimals
4. 6.3: Locate and Compare With Symbols
1. Warm-up: Notice and Wonder: A Digital Scale
2. 7.1: Gold Doubloons
3. 7.2: Exact or Approximate?
1. Warm-up: Estimation Exploration: Number Line
2. 8.1: Name that Number
3. 8.2: Which Number is Closest?
4. 8.3: Round the Numbers
1. Warm-up: True or False: Decimal Inequalities
2. 9.1: Caught in the Middle
3. 9.2: Least to Greatest
1. Warm-up: Notice and Wonder: The Luge
2. 10.1: How Accurate Is It?
3. 10.2: Compare Speeds
4. Section A Summary
5. Section A Practice Problems
2. Section B: Add and Subtract Decimals
1. Warm-up: How Many Do You See: Grids
2. 11.1: The Sum
3. 11.2: Target Numbers: Add Tenths or Hundredths
1. Warm-up: Number Talk: 99 Hundredths
2. 12.1: Use the Standard Algorithm to Add Decimals
3. 12.2: Estimate and Find the Value
1. Warm-up: Estimation Exploration: Many Places
2. 13.1: Compare Calculations
3. 13.2: Same Digits, Different Sums
1. Warm-up: True or False: Decimal Differences
2. 14.1: The Difference
3. 14.2: Target Numbers: Subtract Tenths or Hundredths
1. Warm-up: Number Talk: One and Five Tenths
2. 15.1: Revisit the Algorithm
3. 15.2: Estimate and Subtract
4. 15.3: Compare Calculations to Evaluate a Difference
1. Warm-up: Number Talk: Subtracting Decimals
2. 16.1: What's the Difference?
3. 16.2: Sums and Differences
4. 16.3: Subtraction with Larger Numbers
5. Section B Summary
6. Section B Practice Problems
3. Section C: Multiply Decimals
1. Warm-up: True or False: Place Value Products
2. 17.1: Multiply Decimals By Whole Numbers
3. 17.2: Using Whole Number Products
1. Warm-up: True or False: Group Dynamics
2. 18.1: Agree or Disagree
3. 18.2: Interpret Diagrams and Expressions
1. Warm-up: Number Talk: Many Hundredths
2. 19.1: Card Sort: Decimal Multiplication Card Sort
3. 19.2: Choose a Strategy
4. 19.3: More Multiplication Problems (Optional)
1. Warm-up: What do you know about 1\times 0.1 and 0.1 \times 0.1 ?
2. 20.1: Products of Tenths
3. 20.2: Multiply Tenths
1. Warm-up: Estimation Exploration: Central Park
2. 21.1: Multiply More Decimals
4. Section C Summary
5. Section C Practice Problems
4. Section D: Divide Decimals
1. Warm-up: Number Talk: Remember Division of Unit Fractions
2. 22.1: Patterns in Dividing by Decimal Units
3. 22.2: Divide Whole Numbers by Decimals
1. Warm-up: True or False: Tenths and Hundredths
2. 23.1: Same Divisor, Different Dividend
3. 23.2: Evaluate Expressions
1. Warm-up: Estimation Exploration: Divide by Whole Numbers
2. 24.1: Whole Number Groups
3. 24.2: Evaluate Expressions
1. Warm-up: Number Talk: Same/Different
2. 25.1: Dividing by a Tenth and a Hundredth
3. 25.2: Divide Decimals by Decimals
4. Section D Summary
1. Warm-up: Notice and Wonder: Books for Sale
2. 26.1: Book Prices
3. 26.2: Plan a Book Fair
4. Section D Practice Problems
5. Glossary