Lesson objective: Apply knowledge of how to create, interpret, and evaluate expressions with all four operations and parentheses in order to come up with a reallife situation for a numerical expression.
This lesson provides an opportunity for students to apply their knowledge and understanding of creating, evaluating, and interpreting expressions to a reallife situation. Students are asked to choose at least one of three expressions of varying difficulty and come up with a reallife situation that the expression could represent. Then, the student needs to evaluate the expression using the order of operations.
Key Concept students will use:

we can use grouping symbols to represent different mathematical situations; these sometimes change the value of expressions and sometimes do not.
Skills students will use:
 evaluating numerical expressions using the order of operations
 interpreting the meaning of the calculations completed in an expression
 creating a reallife situation that is represented by an assigned expression
Students engage in Mathematical Practice 2 (reason abstractly and quantitatively) as they create a reallife situation for at least one of three expressions that are at three different levels of difficulty and then evaluate the expression(s) they chose.
Key vocabulary:
 calculate
 evaluate
 numerical expression
 represent
Special materials needed:
 highlighter, if desired, so students can highlight parts of the expressions as they evaluate them