1 Chapter 1 Numbers to 1,000 1.1:  Counting 1.1:  Counting 1.2:  Place Value Also consider: 1.2:  Place Value Also consider: 1.3:  Comparing Numbers 1.3:  Comparing Numbers 1.4:  Order and Pattern Also consider: 1.4:  Order and Pattern Also consider:
 3 Chapter 3 Subtraction up to 1,000 3.1:  Subtraction Without Regrouping Also consider: 3.1:  Subtraction Without Regrouping Also consider: 3.2:  Subtraction with Regrouping in Tens and Ones Also consider: 3.2:  Subtraction with Regrouping in Tens and Ones Also consider: 3.3:  Subtraction with Regrouping in Hundreds and Tens 3.3:  Subtraction with Regrouping in Hundreds and Tens 3.4:  Subtraction with Regrouping in Hundreds, Tens, and Ones Also consider: 3.4:  Subtraction with Regrouping in Hundreds, Tens, and Ones Also consider: 3.5:  Subtraction Across Zeros •Coming soon: Subtraction across zeros Also consider: 3.5:  Subtraction Across Zeros •Coming soon: Subtraction across zeros Also consider:
 4 Chapter 4 Use Bar Models: Addition and Subtraction 4.1:  Using Part-Part-Whole in Addition and Subtraction 4.1:  Using Part-Part-Whole in Addition and Subtraction 4.2:  Adding On and Taking Away Sets 4.2:  Adding On and Taking Away Sets 4.3:  Comparing Two Sets 4.3:  Comparing Two Sets 4.4:  Real-World Problems: Two-Step Problems 4.4:  Real-World Problems: Two-Step Problems
 5 Chapter 5 Multiplication and Division 5.1:  How to Multiply 5.1:  How to Multiply 5.2:  How to Divide Also consider: 5.2:  How to Divide Also consider: 5.3:  Real-World Problems: Multiplication and Division 5.3:  Real-World Problems: Multiplication and Division
 6 Chapter 6 Multiplication Tables of 2, 5, and 10 6.1:  Multiplying 2: Skip-Counting 6.1:  Multiplying 2: Skip-Counting 6.2:  Multiplying 2: Using Dot Paper 6.2:  Multiplying 2: Using Dot Paper 6.3:  Multiplying 5: Skip-Counting 6.3:  Multiplying 5: Skip-Counting 6.4:  Multiplying 5: Using Dot Paper 6.4:  Multiplying 5: Using Dot Paper 6.5:  Multiplying 10: Skip-Counting and Using Dot Paper Also consider: 6.5:  Multiplying 10: Skip-Counting and Using Dot Paper Also consider: 6.6:  Odd and Even Numbers Also consider: 6.6:  Odd and Even Numbers Also consider:
 7 Chapter 7 Metric Measurement of Length 7.1:  Measuring in Meters 7.1:  Measuring in Meters 7.2:  Comparing Lengths in Meters 7.2:  Comparing Lengths in Meters 7.3:  Measuring in Centimeters 7.3:  Measuring in Centimeters 7.4:  Comparing Lengths in Centimeters 7.4:  Comparing Lengths in Centimeters 7.5:  Real-World Problems: Metric Length 7.5:  Real-World Problems: Metric Length
 8 Chapter 8 Mass 8.1:  Measuring in Kilograms •Coming soon: Measure weight in kilograms 8.1:  Measuring in Kilograms •Coming soon: Measure weight in kilograms 8.2:  Comparing Mass in Kilograms 8.2:  Comparing Mass in Kilograms 8.3:  Measuring in Grams •Coming soon: Measure weight in grams 8.3:  Measuring in Grams •Coming soon: Measure weight in grams 8.4:  Comparing Masses in Grams 8.4:  Comparing Masses in Grams 8.5:  Real-World Problems: Mass 8.5:  Real-World Problems: Mass
 9 Chapter 9 Volume 9.1:  Getting to Know Volume 9.1:  Getting to Know Volume 9.2:  Measuring in Liters 9.2:  Measuring in Liters 9.3:  Real-World Problems: Volume 9.3:  Real-World Problems: Volume
 10 Chapter 10 Mental Math and Estimation 10.1:  Meaning of Sum Also consider: 10.1:  Meaning of Sum Also consider: 10.2:  Mental Addition 10.2:  Mental Addition 10.3:  Meaning of Difference Also consider: 10.3:  Meaning of Difference Also consider: 10.4:  Mental Subtraction 10.4:  Mental Subtraction 10.5:  Rounding Numbers to Estimate 10.5:  Rounding Numbers to Estimate
 11 Chapter 11 Money 11.1:  Coins and Bills 11.1:  Coins and Bills 11.2:  Comparing Amounts of Money Also consider: 11.2:  Comparing Amounts of Money Also consider: 11.3:  Real-World Problems: Money Also consider: 11.3:  Real-World Problems: Money Also consider:
 12 Chapter 12 Fractions 12.1:  Understanding Fractions Also consider: 12.1:  Understanding Fractions Also consider: 12.2:  Comparing Fractions Also consider: 12.2:  Comparing Fractions Also consider: 12.3:  Adding and Subtracting Like Fractions 12.3:  Adding and Subtracting Like Fractions
 13 Chapter 13 Customary Measurement of Length 13.1:  Measuring in Feet 13.1:  Measuring in Feet 13.2:  Comparing Lengths in Feet 13.2:  Comparing Lengths in Feet 13.3:  Measuring in Inches 13.3:  Measuring in Inches 13.4:  Comparing Lengths in Inches and Feet 13.4:  Comparing Lengths in Inches and Feet 13.5:  Real-World Problems: Customary Length 13.5:  Real-World Problems: Customary Length
 14 Chapter 14 Time 14.1:  The Minute Hand 14.1:  The Minute Hand 14.2:  Reading and Writing Time Also consider: 14.2:  Reading and Writing Time Also consider: 14.3:  Using A.M. and P.M. Also consider: 14.3:  Using A.M. and P.M. Also consider: 14.4:  Elapsed Time Also consider: 14.4:  Elapsed Time Also consider:
 15 Chapter 15 Multiplication Tables of 3 and 4 15.1:  Multiplying 3: Skip-Counting 15.1:  Multiplying 3: Skip-Counting 15.2:  Multiplying 3: Using Dot Paper 15.2:  Multiplying 3: Using Dot Paper 15.3:  Multiplying 4: Skip-Counting 15.3:  Multiplying 4: Skip-Counting 15.4:  Multiplying 4: Using Dot Paper 15.4:  Multiplying 4: Using Dot Paper 15.5:  Divide Using Related Multiplication Facts 15.5:  Divide Using Related Multiplication Facts
 16 Chapter 16 Using Bar Models: Multiplication and Division 16.1:  Real-World Problems: Multiplication 16.1:  Real-World Problems: Multiplication 16.2:  Real-World Problems: Division 16.2:  Real-World Problems: Division 16.3:  Real-World Problems: Measurement and Money 16.3:  Real-World Problems: Measurement and Money
 17 Chapter 17 Graphs and Line Plots 17.1:  Reading Picture Graphs with Scales 17.1:  Reading Picture Graphs with Scales 17.2:  Making Picture Graphs 17.2:  Making Picture Graphs 17.3:  Real-World Problems: Picture Graphs 17.3:  Real-World Problems: Picture Graphs 17.4:  Bar Graphs and Line Plots 17.4:  Bar Graphs and Line Plots
 18 Chapter 18 Lines and Surfaces 18.1:  Parts of Lines and Curves 18.1:  Parts of Lines and Curves 18.2:  Flat and Curved Surfaces Also consider: 18.2:  Flat and Curved Surfaces Also consider:
 19 Chapter 19 Shapes and Patterns 19.1:  Plane Shapes Also consider: 19.1:  Plane Shapes Also consider: 19.2:  Solid Shapes Also consider: 19.2:  Solid Shapes Also consider: 19.3:  Making Patterns Also consider: 19.3:  Making Patterns Also consider:
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