CCSS.Math.Content.HSF-LE.B
The standard
Interpret expressions for functions in terms of the situation they model
Common Core State Standards for Mathematics · High School — Functions
What this standard means
Students need to connect parts of a function rule to the situation it represents. They should explain what numbers, variables, coefficients, bases, exponents, intercepts, and terms mean in context, not just simplify or graph them.
Mastery looks like reading an expression and saying, for example, what the starting amount is, what changes each step, and whether the change is constant or percent based. Students often mix up rate and initial value, treat exponential growth like repeated addition, or explain symbols without units or context.
Ways to teach it
- Give pairs cards with function rules and situation descriptions, then have them match each term to a labeled part of the story.
- Ask students to write: What does each number in this function tell you about the situation, including units?
- Show one linear and one exponential model, then ask students to identify the starting value and type of change on a sticky note.
- Use phone battery, paycheck, loan, or population data and have students explain what each part of the model means.
Plan a lesson for CCSS.Math.Content.HSF-LE.B
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Related standards
- CCSS.Math.Content.HSA-SSE.A
Interpret the structure of expressions
- CCSS.Math.Content.HSA-SSE.A.1
Interpret expressions that represent a quantity in terms of its context
- CCSS.Math.Content.HSF-IF.B
Interpret functions that arise in applications in terms of the context
- CCSS.Math.Content.HSF-LE.B.5
Interpret the parameters in a linear or exponential function in terms of a context.