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| 1.1: Counting |
| 1.2: Place Value |
| 1.3: Comparing Numbers |
| 1.4: Order and Pattern |
| 2.1: Addition and Subtraction Facts Within 20 |
| 2.2: Addition Without Regrouping |
| 2.3: Addition with Regrouping in Ones |
| 2.4: Addition with Regrouping in Tens |
| 2.5: Addition with Regrouping in Ones and Tens |
| 3.1: Subtraction Without Regrouping |
| 3.2: Subtraction with Regrouping in Tens and Ones |
| 3.3: Subtraction with Regrouping in Hundreds and Tens |
| 3.4: Subtraction with Regrouping in Hundreds, Tens, and Ones |
| 3.5: Subtraction Across Zeros |
| 4.1: Using Part-Part-Whole in Addition and Subtraction |
| 4.2: Adding On and Taking Away Sets |
| 4.3: Comparing Two Sets |
| 4.4: Real-World Problems: Two-Step Problems |
| 5.1: How to Multiply |
| 5.2: How to Divide |
| 5.3: Real-World Problems: Multiplication and Division |
| 6.1: Multiplying 2: Skip-Counting |
| 6.2: Multiplying 2: Using Dot Paper |
| 6.3: Multiplying 5: Skip-Counting |
| 6.4: Multiplying 5: Using Dot Paper |
| 6.5: Multiplying 10: Skip-Counting and Using Dot Paper |
| 6.6: Odd and Even Numbers |
| 7.1: Measuring in Meters |
| 7.2: Comparing Lengths in Meters |
| 7.3: Measuring in Centimeters |
| 7.4: Comparing Lengths in Centimeters |
| 7.5: Real-World Problems: Metric Length |
| 8.1: Measuring in Kilograms |
| 8.2: Comparing Mass in Kilograms |
| 8.4: Comparing Masses in Grams |
| 8.5: Real-World Problems: Mass |
| 9.1: Getting to Know Volume |
| 9.2: Measuring in Liters |
| 9.3: Real-World Problems: Volume |
| 10.1: Meaning of Sum |
| 10.2: Mental Addition |
| 10.3: Meaning of Difference |
| 10.4: Mental Subtraction |
| 10.5: Rounding Numbers to Estimate |
| 11.1: Coins and Bills |
| 11.2: Comparing Amounts of Money |
| 11.3: Real-World Problems: Money |
| 12.1: Understanding Fractions |
| 12.2: Comparing Fractions |
| 12.3: Adding and Subtracting Like Fractions |
| 13.1: Measuring in Feet |
| 13.2: Comparing Lengths in Feet |
| 13.3: Measuring in Inches |
| 13.4: Comparing Lengths in Inches and Feet |
| 13.5: Real-World Problems: Customary Length |
| 14.1: The Minute Hand |
| 14.2: Reading and Writing Time |
| 14.3: Using A.M. and P.M. |
| 14.4: Elapsed Time |
| 15.1: Multiplying 3: Skip-Counting |
| 15.2: Multiplying 3: Using Dot Paper |
| 15.3: Multiplying 4: Skip-Counting |
| 15.4: Multiplying 4: Using Dot Paper |
| 15.5: Divide Using Related Multiplication Facts |
| 16.1: Real-World Problems: Multiplication |
| 16.2: Real-World Problems: Division |
| 16.3: Real-World Problems: Measurement and Money |
| 17.1: Reading Picture Graphs with Scales |
| 17.2: Making Picture Graphs |
| 17.3: Real-World Problems: Picture Graphs |
| 17.4: Bar Graphs and Line Plots |
| 18.1: Parts of Lines and Curves |
| 18.2: Flat and Curved Surfaces |
| 19.1: Plane Shapes |
| 19.2: Solid Shapes |
| 19.3: Making Patterns |