| | Doubling and Halving Numbers |  |   |
| | Using Subtraction to Create and Explore Bar Graphs |  |   |
| | Exploring Logical And Numerical Relationships |  |   |
| Using a Bar Graph to Subtract
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| Exploring Five Subtraction Models — Counting, Sets, Number Line, Balanced Equations, and Inverse of Addition |  |  |
| | Creating Three-Digit Number Combinations |  |   |
| Exploring Four Addition Models — Counting, Number Line, Sets, and Balanced Equations |  |  |
| | Using Algebraic Thinking to Discover Properties of Addition |  |   |
| Exploring Five Representations of Subtraction |  |  |
| | Exploring the Concepts of Greater Than, Less Than, and Equal To |  |   |
| Making Groups of 10 to 20 Objects, Connecting Number Names to the Groups |  |  |
| Connecting Number Words to Groups of Objects |  |  |
| | Playing Games and Using Number Properties to Learn Addition Facts |  |  |
| Exploring "Take Away" Subtraction in Several Different Contexts |  |  |
| | Exploring the Relationship Between Pennies, Nickels, Dimes, Quarters, and Examining Combinations |  |   |
| | Finding Sums of 5, 6, 7, and 8 |  |  |
| | Introducing Young Children to Subtraction |  |  |
| | Finding and Using Numbers at the Toy-Shop |  |  |