Unit 1, Lesson 19

Represent the same story scenario with addends repositioned (the commutative property).

EngageNY 60 min(s)Support for English Language Learners
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.

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