Topic 2: Understanding Subtraction
2-1: Finding Missing Parts of 6 and 7
2-2: Finding Missing Parts of 8
2-3: Finding Missing Parts of 9
2-4: Introducing Subtraction Expressions and Number Sentences
2-5: Stories About Taking Away
2-6: Stories About Comparing
2-7: Stories About Missing Parts
2-8: All Kinds of Subtraction Stories
2-9: Connecting Addition and Subtraction
2-10: Connecting Models and Symbols
2-11: Problem Solving: Act It Out
2-1: Finding Missing Parts of 6 and 7
2-2: Finding Missing Parts of 8
2-3: Finding Missing Parts of 9
2-4: Introducing Subtraction Expressions and Number Sentences
2-5: Stories About Taking Away
2-6: Stories About Comparing
2-7: Stories About Missing Parts
2-8: All Kinds of Subtraction Stories
2-9: Connecting Addition and Subtraction
2-10: Connecting Models and Symbols
2-11: Problem Solving: Act It Out