Grade 7 Lesson plan
Drumlin Fields Farm's Soil Moisture Ledger: A Grade 7 Lesson
A 50-minute grade 7 math lesson where students add and subtract signed decimals to track a fictional farm's stored soil water through a dry irrigation week.
Common Core Math · Grade 7
7.NS.A.3 Solve problems with the four operations on rational numbers
Solve real-world and mathematical problems involving the four operations with rational numbers.
Why water teaches this standard well
Students track a reservoir's net change in level by adding positive rainfall amounts and subtracting negative evaporation and withdrawal amounts across a season. Combining positive and negative rational numbers here mirrors exactly how a water-balance spreadsheet totals gains and losses.
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.
24 materials aligned to 7.NS.A.3
Lesson plans
Grade 7 Lesson plan
Hollenbeck Brook's Stream Gauge: A Grade 7 Conversion Lesson
A 50-minute grade 7 math lesson where students convert a fictional brook's gauge readings between cubic feet per second, gallons per minute, and MGD.
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
Tamarisk Flats Berm Spillway: Iterative Erosion-Control Testing
A 55-minute grade 7 lesson where teams test a model berm spillway across three redesigns, recording freeboard changes to find the most flood-resistant version.
Grade 7 Lesson plan
Blackwood Springs: Tracking Chlorine Demand in Distribution
A grade 7 lesson calculating chlorine demand at two points in a fictional plant's distribution system, checked against the real federal maximum residual limit.
Worksheets
Grade 7 Worksheet
Moorhen Bend's Five Rain Gauges: A Grade 7 Intensity Worksheet
A grade 7 worksheet where students divide fractions of an inch by fractions of an hour to compare rainfall rates at a fictional town's five rain gauges.
Grade 7 Worksheet
Quorley's Backyard Cross-Connections: Air Gaps and Hose Risks
Students apply a two-times air gap rule to three faucets, judge four household hose setups for backflow risk, and find the percent of inspected homes with a risk.
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
A Farnwell Operator Trainee's Conversion Log
A grade 7 worksheet of single-step operator conversions from a fictional plant, covering gallons, pounds, flow, pressure head, acre-feet, and basin volume.
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
Ebbstone's Cast-Iron Mains: A Grade 7 Unit-Rate Worksheet
Students compute crew unit rates from ratios of fractions, convert miles of old pipe to feet, and track signed changes in the pipe still left to replace.
Grade 7 Worksheet
Havenmere Reservoir Water Budget: A Grade 7 Signed-Number Worksheet
A grade 7 worksheet where students add positive inflows and negative losses to track a fictional reservoir's level change over a week using rational numbers.
Grade 7 Worksheet
Thornapple Aquifer Levels: A Grade 7 Signed-Number Worksheet
A grade 7 worksheet where students add and subtract positive and negative monthly changes to track a fictional aquifer's water level across a season.
Grade 7 Worksheet
Verdin Brook Dissolved Oxygen: A Signed-Number Worksheet
A grade 7 signed-number worksheet on the fictional Verdin Brook, where students add and average positive and negative changes in dissolved oxygen downstream.
Grade 7 Worksheet
Foundry Row Water Main: Comparing Pipe Life-Cycle Costs
A grade 7 worksheet where students calculate cost per year of service for two pipe materials and use the results to recommend a water main replacement design.
Grade 7 Worksheet
Willow Marsh Wetland: A Grade 7 Signed-Number Nitrogen Worksheet
A grade 7 worksheet where students add and subtract signed nitrogen-concentration changes through a fictional constructed wetland's four treatment cells.
Math problem sets
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
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
Foxglove Pump Station Flow Rates: A Grade 7 Unit-Rate Set
A grade 7 problem set where students compute unit rates from ratios of fractions for a fictional pump station's flows, then compare and combine the rates.
Grade 7 Math problem set
Gallowmere Dam's Summer Releases: A Grade 7 Flow-Rate Set
Students convert a dam release from cubic feet per second to gallons per day, name the conversion constant, and track signed weekly changes in reservoir level.
Labs & experiments
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.
Quizzes & test questions
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
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
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.