Unit 4, Lesson 7# Replacing Letters with Numbers

EngageNY 45 min(s)

Students understand that a letter represents one number in an expression. Before this lesson, make it clear to students that, just like 3 × 3 is 3^2 or three squared. What is the length of one side of this square? What is the formula for the area of a square? Ask students to work both problems from exercises in their student materials.