Lesson Characteristics of Algebraic Reasoning Lesson 1: 9 + 4 - Using algebraic expressions to represent addition situation and posing situation to represent given expressions - Constructing and using a tool to find problem results more easily - Extending solutions to another domain of number Lesson 2: 8 + 3 - Extending solutions to another domain of number Lesson 3: How many eggs? (3 + 9) - Constructing and using a tool to find problem results more easily - Using algebraic expressions to represent addition situation and posing situation to represent given expressions Lesson 4: 8 + 6 - Using various representation to justify their ways of thinking Lesson 5: Magic Flowers - Reasoning about relations among numbers Lesson 6: Story telling about addition - Using algebraic expressions to represent addition situation and posing situation to represent given expressions Lesson 7: Story telling about 7 + 8 - Constructing and using a tool to find problem results more easily - Using algebraic expressions to represent addition situation and posing situation to represent given expressions - Constructing and using a tool to find problem results more easily Lesson 8: Addition cards - Reasoning about relations among numbers Lesson 9: Playing addition cards - Reasoning about relations among numbers