Students practice grade-level mathematics on real utility quantities such as flow rates, tank volumes, and water bills, using the same formulas that appear on operator licensing exams.
64 materials written for this grade · refine by type, topic, or standard in the catalog
Grade 9 Quiz & test questions
A grade 9 unit test on the fictional Varmoor utility, mixing multiple-choice, short-answer, and computation items on the pounds formula, flow conversions, and pressure.
Grade 9 Math problem set
A grade 9 problem set converting inches of applied water into acre-feet, gallons, and MGD to size a fictional irrigation district's seasonal water budget.
Grade 9 Lesson plan
A 50-minute grade 9 lesson at the fictional Westmere plant, modeling reverse-osmosis recovery rate as permeate over feed and solving for a required feed flow.
Grade 9 Math problem set
A grade 9 problem set on a fictional polishing wetland, using the pounds formula to find nitrogen load, removal rate, detention time, and acres needed.
Grade 9 Worksheet
A grade 9 worksheet on a fictional watershed where students write a runoff equation and convert an annual yield to gallons, MGD, and cubic feet per second.
Grade 9 Project
A grade 9 project where students model a fictional town's rising water-main break trend and propose a pipe-replacement plan within budget and construction limits.
Grade 9 Lesson plan
A grade 9 lesson where students build a linear function from two years of population and water-demand data and decide which quantity best models growth.
Grade 9 Worksheet
A grade 9 worksheet on chlorine dosing at a fictional treatment plant, where students match reported precision to test-kit resolution and significant figures.
Grade 9 Math problem set
A grade 9 problem set where students write and solve one-variable equations for a drought-stricken reservoir's drawdown and a household's rationing constraints.
Grade 9 Lesson plan
A grade 9 lesson comparing a reservoir's constant-rate leak loss to a warm cove's percent-based algae growth, distinguishing linear from exponential models.
Grade 9 Classroom activity
A grade 9 relay activity where teams match pump-station flow data tables to scenario cards and calculate the average rate of change for each.
Grade 9 Math problem set
A grade 9 statistics problem set comparing the mean and standard deviation of chlorine residual readings from two fictional treatment plants.
Grade 9 Worksheet
A grade 9 worksheet where students read a reverse-osmosis membrane's permeate-flow data table, finding key features and average rate of change during fouling.
Grade 9 Worksheet
A grade 9 worksheet where students chain acre-foot, cubic-foot, and gallon conversions to size a fictional town's reservoir allocation in MGD and gpm.
Grade 9 Lesson plan
A grade 9 lesson where students set up and solve a system of linear equations to find the usage level where two water utility billing plans cost the same.
Grade 9 Math problem set
Eight algebra problems that model a subdivision's groundwater well as a linear equation, using drawdown rate, a safety shutoff, and unit conversions.