In this video lesson, students move from using hangers to equations in order to represent a problem. They see how moves that maintain the balance of a hanger correspond to moves that maintain the equality of an equation, match pairs of equations with the corresponding equation move, and compare different choices of moves that lead to the same solution. Students also learn to check a solution by substituting into the equation, reinforcing the idea that a solution is a number that makes the equality in an equation true, and that different moves maintain the equality. Students engage in MP3 as they compare different solution methods and reason how the steps in solving an equation maintain the equality.

Grade 8, Episode 1: Unit 4, Lesson 3 | Illustrative Math