Lesson objective: Solve two-step word problems including a variable in any part of the equation.

This lesson helps to build procedural skill with solving two-step word problems including a variable in any part of the equation. A variable is used here because it supports the representation of the unknown quantity. This work develops students' understanding that you** **can represent unknown quantities in equations using letters.

Students engage in Mathematical Practice 2 (Reason abstractly and quantitatively) as they create logical representations of the problem at hand including a variable for the unknown quantity.

**Key vocabulary:**

- equation
- unknown quantity
- variable