Grade 7 Lesson plan
Mossgrave Courts Greywater: Choosing an Irrigation Layout
A 50-minute grade 7 lesson matching laundry greywater supply to courtyard irrigation demand, then screening three layouts against a coverage target and a budget.
Common Core Math · Grade 7
7.RP.A.3 Solve multistep ratio and percent problems
Use proportional relationships to solve multistep ratio and percent problems. Examples: simple interest, tax, markups and markdowns, gratuities and commissions, fees, percent increase and decrease, percent error.
Why water teaches this standard well
This is the second flagship water-math standard: students compute the percent increase on a water-rate hike, the sales tax on a home water-filter purchase, and the percent of a distribution system's water lost to leaks. Multistep percent problems built on real utility rate changes are the centerpiece of the site's grade 7 math content.
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.
125 materials aligned to 7.RP.A.3
Lesson plans
Grade 7 Lesson plan
Wickersall Salt Yard: Choosing a Runoff Containment Design
A 55-minute grade 7 lesson where students size storm runoff from a fictional road-salt pad, then pick among a full roof, a partial roof, and a catch basin.
Grade 7 Lesson plan
Why Ferrisby Adds Orthophosphate: Corrosion Control and Lead
A 50-minute grade 7 science lesson using a fictional bench test of lead released at five pH values to show how corrosion control lowers lead without digging up pipes.
Grade 7 Lesson plan
Kirkwell River Spill: Hours Until It Reaches Standale's Intake
A 50-minute grade 7 science lesson where students convert a river's current to miles per hour, find a spill's travel time, and plan sampling before the intake closes.
Grade 7 Lesson plan
Torbrook's Combined Sewer: Counting the Storms That Overflow
A 55-minute grade 7 science lesson comparing storm flow with plant capacity at a fictional town's combined sewer, then sizing the overflow a green plan prevents.
Grade 7 Lesson plan
Sable Bend's Drought Ration: Ranking Household Water Uses
Students work out a fictional family's daily gallons under a drought limit, find the percent cut required, and decide which uses protect health and get cut last.
Grade 7 Lesson plan
Ketterwick's Standpipe Loan: A Grade 7 Simple Interest Lesson
A 50-minute grade 7 math lesson where students compute simple interest on a fictional town's loan for a new standpipe and share the cost per household.
Grade 7 Lesson plan
Ravensden's Operator Pay Ladder: A Grade 7 Percent Lesson
A 45-minute grade 7 math lesson where students work out percent raises across a fictional water district's operator certification levels and yearly pay.
Grade 7 Lesson plan
Farriday's Boil-Water Notice: Who Gets Told First
A grade 7 civics lesson in which students study how a fictional water department must notify customers under a boil-water notice, then compute the percentages and costs.
Grade 7 Lesson plan
Who Pays for Tarrowfield's Fire Hydrants?
A grade 7 economics lesson on a fictional town's hydrant costs, in which students compute the yearly cost per account and argue over who should pay for fire protection.
Grade 7 Lesson plan
Fertilizer as Feed and Pollutant: A Nutrient Infographic Lesson
A grade 7 art lesson where students design a two-panel infographic showing how a fictional farm's nitrogen both feeds crops and pollutes a lake.
Grade 7 Lesson plan
Recovering Phosphorus at Dunwick: A Nutrient Career Lesson
A grade 7 careers lesson on the resource recovery technician at a fictional reclamation facility, with percent-removal math and a benefit-and-cost discussion.
Grade 7 Lesson plan
Ballantry School Taps: A Lead Sampling and Retrofit Plan
A grade 7 lesson where students build a proportional sampling plan for a fictional school's drinking taps, infer how many exceed the action level, and size a retrofit.
Grade 7 Lesson plan
Threshel Brook Culvert: Criteria for a Farm Road Crossing
A grade 7 lesson where students use a map scale to find a drainage area, size the design flow for a fictional culvert, and separate its criteria from its constraints.
Grade 7 Lesson plan
Brill Hollow's Tiered Water Bill: Computing Charges and Percents
A 50-minute grade 7 lesson where students compute tiered water bills for a town and explain why higher tiers charge more per gallon to encourage conservation.
Grade 7 Lesson plan
Glasswing Utility Water-Loss Audit: A Grade 7 Percent Lesson
A 45-minute grade 7 lesson where students find the percent of water a fictional utility loses to leaks, then calculate a percent decrease after repairs.
Grade 7 Lesson plan
Rivergate Utility's Retiring Operators: A Grade 7 Percent Lesson
A 50-minute grade 7 lesson using real workforce data and a fictional utility to practice percents of a workforce while surveying water-career education paths.
Grade 7 Lesson plan
Sediment Limits at Silverthorn Creek: A Grade 7 Percent Lesson
A 50-minute lesson in which students chain two percent reductions on a construction site's sediment load, then write an inequality against a permit limit.
Grade 7 Lesson plan
Wexbury Lead Tap Tests: A Grade 7 Probability Lesson
A 45-minute grade 7 lesson where students turn a fictional town's lead-test results into a probability between 0 and 1 and read what that risk means.
Grade 7 Lesson plan
Ashford Mills and PFAS: Reading Parts-Per-Trillion Results
A 45-minute grade 7 science lesson on a fictional town's PFAS-tainted well, where students compare test results to the federal limit and study a rule still being changed.
Grade 7 Lesson plan
Datchford Valley Menus: The Hidden Water Behind Our Food
A 50-minute grade 7 lesson where students compute the water footprint of foods, then build an evidence-based argument about how food choices add to water demand.
Grade 7 Lesson plan
A Day at the Elmsworth Water Lab: Reading Sample Results
Students work a fictional technician's sample log, judge turbidity, chlorine, and pH results against published limits, and learn how operator licensing works.
Grade 7 Lesson plan
Larch Basin's Water Cycle: Where Water Waits and How Long
A 45-minute grade 7 lesson where students model the water cycle driven by sun and gravity, then use a 1,000-marble jar to picture how Earth's water is split.
Grade 7 Lesson plan
Lindenmoor School Rain Garden: A Grade 7 Stormwater Runoff Lesson
A 50-minute grade 7 lesson where students calculate roof runoff and compare pavement to planted ground to design a school rain garden that cuts stormwater.
Grade 7 Lesson plan
Quill Weir Fish Passage: Comparing Three Design Options
A grade 7 lesson in which students score three fish passage options at a fictional mill weir on percent of trout passing, cost per fish, and the town's water intake.
Grade 7 Lesson plan
Tarlton Farm Irrigation Efficiency: A Grade 7 Water-Use Lesson
A 50-minute grade 7 lesson comparing flood and drip irrigation and crop water footprints to show how farms can withdraw less water from rivers and aquifers.
Grade 7 Lesson plan
Should Cindermere and Nettlefold Share One Sewer Plant?
A 55-minute grade 7 lesson in which two fictional towns weigh building separate sewer plants against one shared plant, then split the cost two ways.
Grade 7 Lesson plan
Where a Water Rate Increase Goes: Keswick's Bill and Its Jobs
A 45-minute grade 7 careers lesson where students compute the percent increase on a fictional town's water bill and trace how the revenue pays the utility's workers.
Grade 7 Lesson plan
Reading the Okafor Family's Dunmore Water Bill After a Rate Increase
A grade 7 consumer-math lesson where students read a fictional household water bill, compute a two-step percent rate increase, and judge whether it is affordable.
Grade 7 Lesson plan
Pinebrook's Two-Stage Water Rate Increase: A Grade 7 Percent Lesson
A 50-minute grade 7 lesson where students apply two successive percent increases to a water bill and compare the result to simply adding the two percentages.
Grade 7 Lesson plan
Copperline Creek's Watershed: Measuring 20 Years of Paving Over
A grade 7 lesson calculating the percent increase in a fictional watershed's impervious surface over 20 years, linked to faster stormwater runoff.
Worksheets
Grade 7 Worksheet
Torrenhill Pump Station: Comparing Three Upgrade Options
A grade 7 worksheet that screens three pump station upgrades against capacity, lot size, downtime, and cost limits, then compares their weekly energy use.
Grade 7 Worksheet
Ashfold County's Private Well Screening: Probability Worksheet
A grade 7 worksheet where students turn a fictional county's 400 private well test results into probabilities, predictions, and a percent change after filters.
Grade 7 Worksheet
Pethwick's Corrosion Control Results: A Grade 7 Percent Worksheet
A grade 7 worksheet where students compute percent decrease, percent of a budget, and a cost per account from a fictional water district's lead tap results.
Grade 7 Worksheet
Bramford Brook's Storm Hydrograph: Peak Flow and Lag Time
A grade 7 science worksheet reading an hourly storm hydrograph from a fictional brook: baseflow, peak, lag time, percent recession, flood stage, and warning time.
Grade 7 Worksheet
Harrowden's Water Meter Bench Tests: Percent Error
A grade 7 worksheet where students compute percent error for five meters tested at a fictional town's bench and decide which ones must be replaced.
Grade 7 Worksheet
Wrensfield's Chlorine Residual: A Grade 7 Rate Worksheet
A grade 7 worksheet where students find the loss of chlorine per mile along a fictional town's water main and compute percent decrease and predictions.
Grade 7 Worksheet
Denniston Hollow's Water Bills: An Affordability Worksheet
A grade 7 worksheet in which students compute three fictional households' water bills as a percent of income and test them against a widely used high-burden guideline.
Grade 7 Worksheet
Buckets or Pipes? A Water Cost Worksheet for 1878 Hallowfield
A grade 7 worksheet comparing what a fictional 1878 household paid a water carrier with what it paid the new town waterworks, using unit rates and percent change.
Grade 7 Worksheet
Pellingham's Water Bond Vote: A Turnout and Percent Worksheet
A grade 7 worksheet on a fictional town's ballot measure to rebuild its filter plant, using percent to compare turnout, precinct results, and the cost per account.
Grade 7 Worksheet
Where the Draystone Water Dollar Goes: A Pie-Chart Worksheet
A grade 7 art-and-math worksheet where students turn a fictional utility's budget percentages into dollar amounts and pie-chart slice angles for a bill insert.
Grade 7 Worksheet
Marisbrook's Showerhead Rebate: A Conservation Career Worksheet
A grade 7 worksheet putting students in a water conservation coordinator's seat, using flow rates, percent change, and unit rates from a fictional rebate program.
Grade 7 Worksheet
Cinderfield Seep Cell: Sizing Limestone and Retention Time
A grade 7 worksheet on a fictional quarry seep where students size a limestone treatment cell, test it against a retention-time rule, and deepen it for spring flows.
Grade 7 Worksheet
Pike Hollow PFAS Filter: Sizing Carbon and Flow
Students design a fictional town's carbon filter for PFAS, using percent removal to check each well against the 4.0 ppt limit and sizing the daily flow.
Grade 7 Worksheet
Windleford Junction Fire Flow: Sizing a Storage Tank Reserve
A grade 7 worksheet where students stack a fire reserve, a day of demand, and an operating reserve, then test a fictional village's proposed tank against the total.
Grade 7 Worksheet
Aldermoor Plant Turbidity: A Grade 7 Percent-Removal Worksheet
A grade 7 worksheet where students apply the removal-efficiency formula to a fictional plant's turbidity readings, then check finished water against the NTU limit.
Grade 7 Worksheet
Cobalt Springs Dam Reservoir: A Grade 7 Percent-Change Worksheet
A grade 7 worksheet using a fictional dam's reservoir storage to practice percent of capacity, percent increase, and percent decrease across a season.
Grade 7 Worksheet
Ironvale's Sludge Thickener: A Grade 7 Percent-Solids Worksheet
Students work through percent solids, percent decrease, and percent increase using daily sludge and digester gas records from a fictional recovery facility.
Grade 7 Worksheet
Kestrel Hollow's Lead Service Lines: A Percent Worksheet
A grade 7 percent worksheet set in the fictional town of Kestrel Hollow, where students find lead-line counts, replacement costs, and percent changes.
Grade 7 Worksheet
Brackham's Lead Samples: Reading a 10-Home Tap Test
A grade 7 science worksheet: students read lead results from 10 homes, find the percent above the action level, and judge if the sample fits the town.
Grade 7 Worksheet
Calder Bluff's Service Line Inventory: Which Pipes Come Out First
Students sort a fictional town's 6,000 service lines by material, find percents, and build a ten-year lead pipe replacement schedule with costs.
Grade 7 Worksheet
Calderwick Water Works: Percent Turbidity Removed at Each Stage
A grade 7 science worksheet: students track cloudiness in NTU through a treatment plant, find the percent removed per stage, and compare finished water to the limit.
Grade 7 Worksheet
Dellwood's PFAS Cleanup: Percent Removal and Well Blending
A grade 7 science worksheet where students read a town's PFAS results in parts per trillion, find percent removal by a carbon filter, and blend wells to meet the limit.
Grade 7 Worksheet
Fernvale Middle School Leak Hunt: Drips, Flow Rates, and Waste
A grade 7 worksheet in which students track dripping faucets and showerhead flow at a fictional school and use proportions to total yearly water waste.
Grade 7 Worksheet
Kessler Creek Nutrients: When a Fertilizer Becomes a Pollutant
A grade 7 science worksheet using fictional Kessler Creek data: students compute percent change in nitrogen and phosphorus and trace how excess nutrients lower oxygen.
Grade 7 Worksheet
Marren Falls Well Water: Hardness Testing and Percent Softening
A grade 7 science worksheet where students classify the hardness of two Marren Falls wells and calculate the percent of hardness a softener removes.
Grade 7 Worksheet
Ormsby Brook Dissolved Oxygen: A Grade 7 Fish Habitat Worksheet
A grade 7 science worksheet where students read dissolved-oxygen and temperature data from a cold-water stream and find when the water drops below the level fish need.
Grade 7 Worksheet
Oster Grove Paves a Field: Stormwater Runoff and Percent Change
A grade 7 science worksheet where students compare stormwater runoff from a grass field and a parking lot, using the runoff formula and percent change.
Grade 7 Worksheet
Quarry Bend's Reverse Osmosis Unit: Percent Removal and Recovery
A grade 7 science worksheet on a fictional town's under-sink reverse osmosis unit: students calculate percent of dissolved solids removed and the unit's water recovery.
Grade 7 Worksheet
Sannox Ridge Snowpack: Snow Water Equivalent and Spring Runoff
Students turn snow depth and density readings from a fictional mountain basin into snow water equivalent, forecast spring runoff, and model the path to a reservoir.
Grade 7 Worksheet
Tanner Creek Water Quality: Oxygen, Temperature, and pH
A grade 7 science worksheet comparing dissolved oxygen, temperature, and pH at two sites on fictional Tanner Creek, with percent-change work and a fish habitat benchmark.
Grade 7 Worksheet
Sludge Microbes at Wickford Water Reclamation: Grade 7 Worksheet
A grade 7 science worksheet on the microbes that clean wastewater: students reason about food and oxygen supply and compute the percent of BOD an aeration tank removes.
Grade 7 Worksheet
Cranberry Landing's Tiered Water Rates: A Billing Worksheet
A grade 7 worksheet on a fictional utility's tiered water rates, where students compute household bills and see how block pricing rewards using less water.
Grade 7 Worksheet
Testing 250 Taps in the Kestermere Schools
A grade 7 worksheet on a fictional district's lead testing results, using percent shares and filter costs to help a school board set its priorities.
Grade 7 Worksheet
Quarry Bend's Aging Pipes: A Percent and Priorities Worksheet
A grade 7 worksheet on a fictional water district's aging pipe network, using percent and cost calculations to plan which pipes to replace first.
Grade 7 Worksheet
Water Use in the Ravensmere, Tarnsley, and Ingerfield Basins
A grade 7 worksheet comparing farm, household, and factory water use in three fictional river basins using percent shares and a drought cut.
Grade 7 Worksheet
Cost, Pay, and Percent: Comparing Water-Career Training Paths
A grade 7 careers worksheet where students use percent to compare the up-front cost of three water-sector training paths against real operator pay data.
Grade 7 Worksheet
Reading a Sampling Log: A Water Testing Technician at Marlow Springs
A grade 7 careers worksheet where students read a water testing technician's field log and compare turbidity, chlorine, pH, and pressure readings to real limits.
Grade 7 Worksheet
Choosing a Home Water Filter for the Delacroix Family
A grade 7 consumer worksheet comparing three home water filters by cost per gallon and what they remove, including PFAS, for a fictional family.
Grade 7 Worksheet
The Halvorsen Home Leak Audit: Gallons and Dollars Wasted
A grade 7 consumer worksheet where students turn a fictional home's leaks into gallons and dollars per year using real EPA drip and leak figures.
Grade 7 Worksheet
Harwick's Lead Tap Test: Sampling and Probability
A grade 7 worksheet using a fictional town's lead tap results to find the probability a random tap exceeds the action level and decide what to do.
Grade 7 Worksheet
Hemlock Bend RO Pilot: Sizing Recovery Rate and Reject Volume
A grade 7 worksheet where students use a stated recovery rate to size a reverse-osmosis pilot's clean water output and reject volume against a service constraint.
Grade 7 Worksheet
Alder Run's Aeration Tank: Bacteria, Oxygen, and BOD Removal
A grade 7 worksheet on activated-sludge treatment biology, using real EPA effluent standards to calculate percent BOD removal at a fictional facility.
Grade 7 Worksheet
Millbrook's Water Rate Hearing: A Percent-Increase Worksheet
A grade 7 worksheet on a fictional town's proposed water rate increase, applying multistep percent problems and a common affordability guideline to different households.
Grade 7 Worksheet
The Twin Rivers Compact: Allocating Water in Acre-Feet
A grade 7 worksheet using a fictional two-state river compact to practice acre-foot conversions and multistep percent problems tied to interstate water allocation.
Grade 7 Worksheet
Blue Harbor Water Bill: A Multistep Percent Increase Worksheet
A grade 7 math worksheet where students compute two households' water bills before and after a rate increase, applying multistep percent reasoning to a fictional utility.
Math problem sets
Grade 7 Math problem set
The Okonkwo Home Water Audit: Meter Tests, Leaks, and Wastewater
A grade 7 science problem set in which students use meter tests and a dye test to find a home leak, then trace where indoor and outdoor water goes.
Grade 7 Math problem set
Kestleby's Pressure Zones: A Distribution Operator's Math
A grade 7 problem set on tank height and water pressure in a fictional town, using the constant of proportionality and percent change the way an operator does.
Grade 7 Math problem set
Sundrell's Booster Station: An Operator Trainee's Pump Log
A grade 7 problem set built on one fictional booster station log, moving from a complex-fraction unit rate to proportional equations and license-hour percents.
Grade 7 Math problem set
Hallowfell Basin Snowpack: A Percent-of-Average Problem Set
A grade 7 problem set where students turn April snow measurements from a fictional basin into percents of average and predict the summer water supply.
Grade 7 Math problem set
Delvin's Leak Survey: Water-Loss Math for a Detection Crew
A grade 7 problem set following a leak detection crew through one fictional town's water audit, using percent of pumped water, unit rates, and percent change.
Grade 7 Math problem set
Copperline Lead Service Line Replacement: A Percent and Budget Set
Students plan a fictional town's lead service line replacement, finding yearly pace, program cost, grant share, and how a test result compares to the action level.
Grade 7 Math problem set
Ironmoss Creek Digester: Biogas Sizing and Solids Reduction
A grade 7 problem set on a fictional sludge digester where students work percent reduction, biogas volume, and the share of a plant's daily electricity it covers.
Grade 7 Math problem set
Quarrystone Hollow Fish Ladder: Scale Drawing and Pool Steps
A grade 7 problem set on a fictional dam where students size a fish ladder's pool steps, convert between drawing inches and real feet, and redraw at a second scale.
Grade 7 Math problem set
Sunhollow Farm Drip Irrigation: Proportional Water Savings
Students compare a fictional farm's sprinkler and drip systems, using proportional reasoning and percent to size the daily and seasonal water they save.
Grade 7 Math problem set
Thistledown Constructed Wetland: Nutrient Removal Design Set
Students size a fictional constructed treatment wetland, compute nutrient removal percentages, and check the design against a budget and a water-quality goal.
Grade 7 Math problem set
Ardsley Desalination Energy Use: A Grade 7 Proportional Reasoning Set
A grade 7 problem set on desalination's energy cost: students use per-1,000-gallon kWh rates to compare seawater and conventional treatment and find unit rates.
Grade 7 Math problem set
Blending Peckhaven's Two Wells: A Grade 7 PFAS Mixing Set
Students weight each well's PFOA level by its share of the blended flow, compare that result to a plain average, and find the percent drop needed to meet the limit.
Grade 7 Math problem set
Dunmore Reclamation Plant: A BOD Percent-Removal Problem Set
A grade 7 problem set at the fictional Dunmore plant, where students find the percent of waste removed across treatment stages and check it against the standard.
Grade 7 Math problem set
Halden Plant Chlorine Dosing: A Grade 7 Proportion Set
A grade 7 set where students scale a proportional chlorine feed and work with dose, demand, and residual in mg/L for a fictional drinking-water plant.
Grade 7 Math problem set
Hartsel's Water Rate Increase: A Percent-Change Problem Set
A grade 7 problem set: students compute a town's water bills before and after a rate hike, find percent increases, and check them against affordability guidance.
Grade 7 Math problem set
Pelham Reach Farm Nitrogen: A Grade 7 Percent Problem Set
A grade 7 problem set tracking nitrogen on a fictional farm as both a crop resource and a runoff pollutant, using multistep percent of a changing base.
Grade 7 Math problem set
Saltcedar Reverse Osmosis: A Grade 7 Recovery-Percent Set
A grade 7 set where students find recovery and salt-removal percents, percent increase, and energy cost for a fictional reverse-osmosis plant using decimal chains.
Grade 7 Math problem set
Corbray Reservoir in a Dry Year: Acre-Feet and Days of Supply
Ten problems in which students convert acre-feet to gallons, compute days of supply for a fictional town, and test how growth and evaporation shorten it.
Grade 7 Math problem set
Graymoor's Sedimentation Basin: Volume and Detention Time
A grade 7 science problem set on a fictional plant's settling basin: students find its volume in gallons, its detention time, and the percent of turbidity removed.
Grade 7 Math problem set
Harlow Heights Roof Runoff: A Rain-Capture Problem Set
A grade 7 science problem set on a fictional school's rooftop rain capture, finding runoff gallons, cistern percent captured, and how surface type changes runoff.
Grade 7 Math problem set
Marchford's Water Loss Audit: Percent Lost Between Plant and Tap
Ten problems comparing what a fictional city's plant produces with what its meters record, finding the percent lost to leaks and what a repair program recovers.
Grade 7 Math problem set
Wetherby Reservoir Road-Salt Chloride: A Grade 7 Proportion Set
A grade 7 problem set tracking chloride from winter road salt in a reservoir: percent increase, proportional rates, ppm equivalence, and percent error.
Grade 7 Math problem set
Certification Hours and Pay: An Operator's Math at Anders District
A grade 7 careers math set following an operator's continuing-education hours and license-class pay, using percent and unit-rate reasoning with real operator pay data.
Grade 7 Math problem set
Nettleton Rain Barrel Array: A Proportional Relationship Set
Seven problems where students test a rain barrel array for proportionality, write its equation, and use percent to see how much of a storm it can capture.
Grade 7 Math problem set
Brackenmoor Retention Basin: A Budget and Percent Problem Set
Eight problems where students apply a bulk discount, sales tax, and an installation fee to a stormwater basin materials budget and check it against a total.
Grade 7 Math problem set
Salt Fork Booster Station: Combining Two Pumps to Fill a Hilltop Tank
A grade 7 math set on a fictional booster station's two pumps, using proportional reasoning and percent problems to compare fill times and a fill-rate goal.
Labs & experiments
Grade 7 Lab / experiment
Kelby Flats Aquifer Materials: A Grade 7 Porosity and Flow Lab
A grade 7 lab where students measure porosity and soak-in time for gravel, sand, and a mix, then use a boring log to compare a sand-gravel aquifer with clay.
Grade 7 Lab / experiment
Kirkstall Park Splash Pad: A Water Turnover Dilution Test
Groups model a splash pad's water turnovers with food coloring, rate the fading color, and calculate why fresh water alone cannot clean up a contamination event.
Grade 7 Lab / experiment
Lake Tamsett Beach Clarity: A Lifeguard Visibility Test
Students cloud water with measured soil, record the depth where a marked disk disappears, and use the data to judge when a lake beach is too murky to guard.
Grade 7 Lab / experiment
Saltcrest Ridge Fog Catcher: Testing Mesh Panels for Water Capture
A grade 7 lab where students build three mesh panels, spray them under identical conditions, and use the collected volumes to design a better fog-catching panel.
Grade 7 Lab / experiment
Stroudwell Ridge Soils: How Much Irrigation Water Does Soil Hold?
Students pour a measured 100 mL through sand, loam, and clay soil samples, calculate the percent each soil holds, and use the results to set an irrigation schedule.
Classroom activities
Grade 7 Classroom activity
Chalkmere Utility Design Review: Four Constraint Stations
A grade 7 station rotation where teams make one decision at each of four water-utility desks, then compare the constraints that pushed each role toward a choice.
Grade 7 Classroom activity
Setting Tidemill's Water Rate: A Grade 7 Budget Station Activity
Four rotating stations have each group act as a water district board, computing the percent increase, the revenue it raises, and the burden on a household.
Grade 7 Classroom activity
Bottled or Tap? A Gullhaven Cost-Per-Gallon Comparison
A grade 7 activity where teams compute the cost per gallon of bottled water versus tap and weigh cost, quality, and waste for a fictional school.
Projects
Grade 7 Project
Cutting Nitrogen at Crannock Farm: A Grade 7 Watershed Project
A five-session grade 7 math project where teams price farm practices, compute percent reductions, and pitch a nitrogen plan to a fictional watershed board.
Grade 7 Project
Slateford Clean-Water Plant Public Art Commission
A grade 7 art project where teams design a scale mural and three tour signs for a fictional clean-water plant within a set budget.
Quizzes & test questions
Grade 7 Quiz & test questions
Nettleby's Storm Drain Crew: An Inspection-Season Quiz
A grade 7 careers quiz on a fictional stormwater crew's inspection season, combining map-scale problems, percent items, and questions about crew safety rules.
Grade 7 Quiz & test questions
Shift Handoff at Ravensmill: A Water Reclamation Careers Quiz
A grade 7 careers quiz on the roles, records, and percent math of one overnight shift at a fictional water reclamation plant, with a nine-item key.
Grade 7 Quiz & test questions
Delta Vale Stormwater Retrofit: Engineering Design Unit Test
A grade 7 engineering unit test on a fictional stormwater retrofit, mixing multiple-choice, short-answer, and computation items on runoff and percent reduction.
Grade 7 Quiz & test questions
Tallowmere Orchard Pond Liner: Grade 7 Engineering Design Test
A 32-point grade 7 test where students size a fictional irrigation pond, compute seepage saved by two liners, and compare their yearly costs before recommending one.
Grade 7 Quiz & test questions
Byrne Hollow Farm Irrigation Records: A Grade 7 Math Quiz
A 25-point quiz on one fictional farm's records, mixing complex-fraction pump rates, percent decrease in nitrogen runoff, and a probability drawn from field samples.
Grade 7 Quiz & test questions
Selwyn Household Water Use: A Grade 7 Rates and Percent Quiz
A grade 7 quiz on the fictional Selwyn household, mixing multiple-choice, computation, and a probability item across percent and unit-rate reasoning on daily water use.
Grade 7 Quiz & test questions
Sunmere Drought Water Budget: A Grade 7 Desalination Quiz
A 30-minute grade 7 quiz where students use signed numbers and percents on a fictional coastal district's reservoir, conservation, and desalination plan.
Grade 7 Quiz & test questions
Cattail Creek Pollution and Policy: A Grade 7 Quiz
A grade 7 quiz on point and nonpoint water pollution in a fictional watershed, mixing multiple-choice, short-answer, and percent items with a policy question.
Grade 7 Quiz & test questions
Grendon Buys Water From Kilbourne: A Grade 7 Quiz
A 27-point grade 7 quiz on a fictional town choosing between buying treated water from a neighbor and building its own plant, with percent and cost items.
Grade 7 Quiz & test questions
Marlstone Treatment Pilot: A Grade 7 Engineering Unit Test
A 22-point grade 7 unit test with multiple-choice, short-answer, and computation items on design criteria, removal efficiency, and backwash waste.
Career spotlights
Grade 7 Career spotlight
The Backflow Tester Who Guards Tenbury's Drinking Water
A grade 7 spotlight on a cross-connection control specialist, following a testing route in the town of Tenbury with percent questions and a licensing path.
Grade 7 Career spotlight
The Technician Who Runs Halvergate's PFAS Filters
A grade 7 spotlight on a treatment technician who operates carbon filter vessels for PFAS in the town of Halvergate, with percent-removal questions and a licensing path.
Grade 7 Career spotlight
The Water Master Who Divides the Tillingham River
A grade 7 spotlight on an irrigation district water master, following a delivery day on the fictional Tillingham River with ratio, percent, and acre-foot questions.