Lesson 4: 1.4 Evaluating Simple Expressions
Duration of Days: 5
Lesson Objective
Students will substitute given whole numbers for variables and calculate the final value.
What does a letter represent in a math problem, and how do we replace it?
Variable
Substitute
Expression
Evaluate
CCSS.MATH.CONTENT.6.EE.A.2
Description: The teacher introduces variables as "empty boxes." Given an expression (e.g., 2x + 3) and a value (x = 4), students write "4" on a physical sticky note, place it over the 'x', and apply order of operations to solve.
Purpose: To demystify letters in math and teach the foundational substitution skill needed for real-world formulas (like hourly wage calculations).
DOK Level: DOK 2 (Skill/Concept) - Interpreting a visual representation and applying a multi-step routine.
Use physical sticky notes to physically cover the letter with the number; provide expressions with only one variable to start.
Adapted Quiz: The expression and the substitution are provided (ex. 3x where x=2). Students draw a line to the correct final evaluated number.
Small sticky notes, "empty box" expression templates.