In this video lesson, students are introduced to the idea of equivalent expressions. Two expressions are equivalent if they have the same value, regardless of the value of the variables. Students use diagrams where the variable is represented by a generic length to decide if expressions are equivalent, and they show that expressions are not equivalent by giving values of the variable that make them unequal. They identify simple equivalent expressions using familiar facts about operations.

Grade 6, Episode 14: Unit 6, Lesson 8 | Illustrative Math