Grade 8 Lesson plan
Ostermere Lab Logbook: Deciding What Counts as a Function
A 45-minute grade 8 lesson in which students test relations from a fictional plant's lab logbook against the definition of a function and find a duplicated entry.
Common Core Math · Grade 8
8.F.A.1 Understand functions as rules with one output per input
Understand that a function is a rule that assigns to each input exactly one output. The graph of a function is the set of ordered pairs consisting of an input and the corresponding output.
Why water teaches this standard well
Students recognize that a tank's water depth is a function of elapsed time while it fills, since each moment in time has exactly one corresponding depth. This first formal encounter with function language uses a filling tank as the clearest possible everyday example.
Materials tagged with this code are written to the full standard , and each carries a written note explaining the alignment. See how we review materials.
9 materials aligned to 8.F.A.1
Lesson plans
Grade 8 Lesson plan
Pebble Run Storm Hydrograph: Reading and Sketching Graphs
A 45-minute grade 8 lesson where students treat a creek's storm hydrograph as a function of time and sketch and describe its rise, peak, and slow fall after a rainstorm.
Grade 8 Lesson plan
Wickerstone Plant Inflow: The Shape of a 24-Hour Day
A grade 8 lesson on describing and sketching qualitative graphs, using a fictional water reclamation plant's twelve inflow readings across one day.
Worksheets
Grade 8 Worksheet
Galebrook Lead Sampling: Which Rules Are Functions?
A grade 8 worksheet using a fictional lead sampling program, where students decide which pairings assign exactly one output to each input.
Grade 8 Worksheet
Nordhaven's Overnight Tank Trend: Reading an Operator's Chart
A grade 8 worksheet where students read a fictional utility's overnight tank-level log, find rates of change, build a linear function, and predict an overflow time.
Grade 8 Worksheet
Tallowfield Digester Records: Function Tables and Rules
A grade 8 worksheet using a fictional water reclamation plant's digester records to decide which tables are functions and to write the rule for one of them.
Grade 8 Worksheet
Foxhollow School Rainwater Cistern: A Linear Function Worksheet
A grade 8 worksheet modeling a rainwater cistern's fill, hold, and drain phases as linear functions of time, interpreting the rate of change from each phase.
Classroom activities
Grade 8 Classroom activity
Function or Not a Function: A Water-System Sorting Relay
A grade 8 movement activity where teams sort water-system relations into function or not a function using the rule that each input has exactly one output.
Quizzes & test questions
Grade 8 Quiz & test questions
Ospreyville Phosphorus Cleanup: A Grade 8 Unit Test
A grade 8 unit test on functions, unit rates, linear equations, and volume, set in a fictional town reducing phosphorus in the Sallowbrook River.