Unit 1, Lesson 19# Represent the same story scenario with addends repositioned (the commutative property).

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This lesson introduces the commutative property. Students write two expressions to represent the same quantity and place them in the context of an equation. For example, when examining a group of 4 red counters and 3 white counters, they write the expressions 4 + 3 and 4 + 3 to represent the total number of counters, and then create the equation 4 + 3 = 3 + 4. Finally, they determine that two numbers make the same total, regardless of whether one of the numbers appears first or second in equations and expressions.