Unit 4, Lesson 18# Writing and Evaluating Expressions--Addition and Subtraction

EngageNY 45 min(s)

Students use variables to write expressions involving addition and subtraction from real-world problems. Students evaluate these expressions when given the value of the variable. When students write expressions, make sure they are as specific as possible. Students conclude that in word problems, each letter represents a number, and its meaning must be clearly stated.