Grade 12 Lesson plan
Bramleigh Hydrant Flow Test: Flow as a Square-Root Model
A 55-minute grade 12 math lesson in which students model hydrant discharge as a square-root function of pitot pressure and rate a loop against a needed fire flow.
Common Core Math · High School
HSN-Q.A.3 Choose an appropriate level of accuracy
Choose a level of accuracy appropriate to limitations on measurement when reporting quantities.
Why water teaches this standard well
Students decide how many significant figures to report for a chlorine residual reading given the precision of the test kit, avoiding false precision in a lab result. Matching reported accuracy to instrument precision is a habit every water-quality technician is trained to follow.
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.
71 materials aligned to HSN-Q.A.3
Lesson plans
Grade 12 Lesson plan
Wrentmere Corrosion Control: A Water Quality Specialist Lesson
Students take the role of a corrosion control specialist, calculating orthophosphate feed, reporting pH to meter precision, and ranking lead tap samples.
Grade 11 Lesson plan
A Day as a Water Lab Analyst at Valcour: Reading the Bench Sheet
A 45-minute grade 11 lesson where students act as a water quality lab analyst, judging bench-sheet readings against limits and reporting at instrument precision.
Grade 10 Lesson plan
Nettleton Plant Breakpoint Chlorination: Reading the Curve
A 50-minute grade 10 chemistry lesson where students read a breakpoint chlorination curve, calculate chlorine demand, and find the dose for a target residual.
Grade 11 Lesson plan
Calibrating a Nitrate Test at Marlow Water Lab: A Regression Lesson
A grade 11 lesson where students fit a line to a colorimetric nitrate calibration curve and use it to convert sample absorbances into concentrations at a fictional lab.
Grade 10 Lesson plan
Fernvale's PFAS Wells: Evaluating an Advanced Treatment Solution
A grade 10 lesson where students compare well test results to the federal PFAS limit and evaluate a proposed carbon-filter treatment upgrade.
Grade 12 Lesson plan
Designing an Accessible Water Quality Report: A Grade 12 Lesson
A grade 12 lesson where students translate real water-quality thresholds into an accessible infographic for a fictional utility, applying design and precision choices.
Worksheets
Grade 12 Worksheet
Orrin Gap Main Profile Poster: Choosing a Vertical Exaggeration
Grade 12 students set scales for a fictional pipeline profile poster, find vertical exaggeration and pressure head, and design how the hydraulic grade line reads.
Grade 10 Worksheet
Corrindale Sands Desalter: Brine Load, Dilution, and Precision
A grade 10 worksheet using the pounds formula to find a fictional desalter brine strength, then solving a dilution equation and reporting at meter precision.
Grade 11 Worksheet
Corbenwood Corrosion Control: Orthophosphate Feed and Lead Results
A grade 11 careers worksheet in which a water quality chemist sets an orthophosphate feed rate in pounds, gallons, and mL per minute, then ranks 20 lead sample results.
Grade 10 Worksheet
Chlorine Loss in Sarnwick's Pipes: Testing Two Decay Models
Grade 10 students test a constant-loss model against a halving model of chlorine residual, using sample readings from a fictional town's pressure zone.
Grade 10 Worksheet
Ondine Creek Turbidity Chart: Grade 10 Honest Data-Design Worksheet
A grade 10 design worksheet where students build an honest bar chart from a fictional lab's turbidity readings, setting axis origin, scale, and reporting precision.
Grade 11 Worksheet
Calder Basin Water Use: Designing an Isotype Chart
Grade 11 students convert a fictional district's daily water use into icon counts, fit the rows to a report column, and test a scaled-icon distortion.
Grade 9 Worksheet
A Calder Creek Water-Quality Dashboard: Grade 9 Value-Ramp Worksheet
Grade 9 art and data worksheet where students design an accessible value-ramp status dashboard and match displayed precision to instrument limits.
Grade 10 Worksheet
Baymoor PFAS Cleanup: A GAC Treatment Technician Worksheet
A grade 10 careers worksheet where students act as a treatment technician at fictional Baymoor, checking PFAS levels against the MCL and reporting to the right precision.
Grade 12 Worksheet
Reading Lab Results at Hollindale's Water Plant
A grade 12 careers worksheet where students act as a lab analyst, comparing fictional water quality results against EPA limits and computing removal efficiency.
Grade 11 Worksheet
Selby Reach Monitoring Data: Turbidity and Chlorine Statistics
A grade 11 worksheet where students compute the mean, median, and range of a week of turbidity and chlorine readings and compare them to treatment standards.
Grade 12 Worksheet
Pindrock Meter Test Bench: Accuracy and Lost Revenue Worksheet
A grade 12 worksheet where students grade water meters on a fictional utility's test bench, compute percent accuracy, and trace under-registration into lost revenue.
Grade 9 Worksheet
Maren's Cross-Country Sweat Rate and Hydration Worksheet
Grade 9 consumer-health worksheet where students convert a runner's weight loss into ounces, cups, and milliliters to plan fluid replacement.
Grade 9 Worksheet
The Renslow Well PFAS Report: A Parts-per-Trillion Worksheet
Grade 9 consumer-health worksheet reading a fictional well's PFAS results against the 4.0 ppt limit, with percent-of-limit and trace-concentration math.
Grade 9 Worksheet
The Yardley Home Water-Test Kit: pH, Chlorine, and Turbidity
Grade 9 consumer-health worksheet reading a fictional home test kit and comparing pH, chlorine, turbidity, and hardness to common water-quality guidelines.
Grade 10 Worksheet
Thistledown Creek Water Quality Monitoring Worksheet
A grade 10 worksheet where students compute turbidity removal efficiency, compare dissolved oxygen to a fish benchmark, and check pH for a fictional creek.
Grade 11 Worksheet
Marrow Gap Booster Pump Station: Flow, Head, and Precision
A grade 11 worksheet on a fictional booster pump station: pipe area, velocity, flow-rate conversions, well drawdown, and head-to-pressure with sensible precision.
Grade 11 Worksheet
Wendover Valley Hypochlorite Feed: Dose and Pump-Setting Math
A grade 11 operator-math worksheet: turn a chlorine dose at a fictional plant into pounds per day, gallons of 12.5% hypochlorite, and a feed-pump setting.
Grade 12 Worksheet
Ackworth Tap Sampling: The 90th Percentile and the Lead Rule
A grade 12 worksheet using twenty fictional tap results to build a five-number summary, find the 90th percentile, and test it against the lead action level.
Grade 12 Worksheet
Glenmarr Hydroelectric Station: Storage and Power Output
A grade 12 worksheet using unit analysis to convert reservoir storage and turbine flow and compute a fictional dam's power output.
Grade 12 Worksheet
Marchwood Softening Plant: Hardness, Alkalinity, and Lime Dose
A grade 12 operator-math worksheet on lime softening: hardness in grains and mg/L as CaCO3, removal efficiency, lime feed in pounds per day, and detention time.
Grade 12 Worksheet
Operator Unit Conversions at the Oswell Water Authority
A grade 12 math worksheet drilling the flow, volume, weight, and concentration conversions on operator-certification exams, all built around one fictional utility.
Grade 12 Worksheet
Thistledown GAC Contactors: PFAS Removal and Reporting Precision
A grade 12 worksheet on a fictional town's carbon filters, computing PFOA and PFOS removal efficiency and reporting results at the precision the lab method allows.
Grade 9 Worksheet
Dunmere Clarifier Testing: Removal Efficiency and Oxygen
A grade 9 water-testing worksheet at the fictional Dunmere plant, calculating turbidity removal efficiency and checking dissolved oxygen against a fish limit.
Grade 10 Worksheet
Aldermere Plant UV Disinfection: Dose and Log Inactivation
A grade 10 science worksheet where students calculate ultraviolet dose from intensity and contact time, then test it against a fictional plant's inactivation targets.
Grade 11 Worksheet
Coldstream Well 4: Drawdown, Total Dynamic Head, and Pump Power
A grade 11 hydraulics worksheet where students compute drawdown, specific capacity, total dynamic head, and pump horsepower for a fictional municipal well.
Grade 12 Worksheet
Ferngate High-Service Pump: Tank Fill, Pressure, and Energy
A grade 12 science worksheet using operator math to find a fictional booster station's tank fill time, discharge pressure, and daily energy cost.
Grade 12 Worksheet
Alum Coagulant Dosing at the Penhallow Treatment Plant
A grade 12 worksheet applying the pounds formula, flow conversions, and turbidity removal efficiency across a fictional plant's coagulation and disinfection train.
Grade 9 Worksheet
Ashvale Reclamation Plant: BOD Loading and Removal Efficiency
A grade 9 science worksheet using the pounds formula and removal-efficiency formula on a fictional plant's flow to judge how well it cleans wastewater.
Grade 9 Worksheet
Water Hardness Testing at Calderwood: A Grade 9 Titration Worksheet
A grade 9 worksheet where students turn drop-count titration readings into water hardness in mg/L as calcium carbonate, classify samples, and find percent removal.
Grade 9 Worksheet
Dunmore Lead Tap Sampling: Reading the Action Level
A grade 9 worksheet where students analyze a fictional town's lead tap-sampling data, find the 90th-percentile value, and compare it to the action levels.
Grade 9 Worksheet
Reed Valley Wastewater Plant: Removal Efficiency Worksheet
A grade 9 engineering worksheet on a wastewater plant: students compute BOD and TSS removal efficiency and pollutant loads and check them against the secondary standard.
Grade 10 Worksheet
Nettlebrook Reservoir: Chlorine Dosing and pH Compliance Worksheet
A grade 10 worksheet on chlorine dosing with the pounds formula and pH compliance checks against real EPA drinking-water standards for a fictional treatment plant.
Grade 9 Worksheet
Copper Hollow's Chlorine Log: Precision and Significant Figures
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 10 Worksheet
Foxglen Reservoir: pH, Alkalinity, and Corrosion-Control Chemistry
A grade 10 chemistry worksheet where students use pH and alkalinity data from a fictional reservoir to reason about corrosion control and drinking water standards.
Grade 11 Worksheet
Thornbury's Jar Test: Coagulation Chemistry and Turbidity Removal
Grade 11 students calculate turbidity-removal percentages from a fictional plant's alum jar test and explain coagulation using particle surface charge.
Grade 9 Worksheet
Chlorine Dosing at Thistle Hollow: A Grade 9 Unit-Conversion Worksheet
A grade 9 worksheet where students chain unit conversions and the pounds formula to calculate chlorine feed rates for a fictional town's water treatment plant.
Math problem sets
Grade 9 Math problem set
Tollesby Plant Exam Prep: Operator Conversion and Dosage Drills
Ten grade 9 careers problems drilling the conversions an operator certification exam asks for, all drawn from one fictional plant's tanks, flows, and chlorine feed.
Grade 10 Math problem set
Dunmoor Plant Fluoride and Alum Feed: The Pounds Formula
A grade 10 problem set where students compute chemical feed rates in pounds per day with the operator pounds formula and convert between mg/L, percent, and ppm.
Grade 11 Math problem set
Kestrel Bend PFAS: GAC Contactor Sizing and Contact-Time Problems
A grade 11 math problem set on removing PFAS with granular activated carbon: percent reduction, flow conversions, bed volume, and empty bed contact time.
Grade 11 Math problem set
Ospringe's Two Sources: pH on a Logarithmic Scale
A grade 11 problem set converting pH to hydrogen ion concentration for two fictional sources, blending them, and sizing the soda ash dose that follows.
Grade 9 Math problem set
Marbury Phosphorus Removal: Alum Dose and Nutrient Recovery
A grade 9 set using the pounds formula to size chemical dosing for phosphorus removal at a fictional water resource recovery facility, then to weigh nutrient recovery.
Grade 9 Math problem set
Ash Creek Treatment Plant: Detention, Filters, Chlorine
A grade 9 engineering set on a surface water plant: students size a sedimentation basin's detention time, a filter loading rate, and a chlorine feed in pounds per day.
Grade 11 Math problem set
Corbett Springs Plant: Detention, Filter Loading, and Chlorine Math
A grade 11 math set sizing the fictional Corbett Springs treatment plant: basin volume, detention time, filter loading rate, and a chlorine feed calculation.
Grade 10 Math problem set
Kettlebrook's Aging Water Main: A Leak-Loss Problem Set
An 8-problem grade 10 set where students track gallons and cost lost to a leaking water main, chaining unit conversions from gallons per minute to acre-feet.
Labs & experiments
Grade 12 Lab / experiment
Quarryhill Soap Titration: Calibrating a Water Hardness Test
A grade 12 chemistry lab where students calibrate a soap titration with Epsom-salt standards, estimate tap-water hardness as CaCO3, and check it against EDTA.
Grade 12 Lab / experiment
Boil-Down Lab: Why Boiling Concentrates Nitrate and Lead in Water
A grade 12 health lab where students boil a salt solution, track volume and dissolved solids with a TDS meter, and explain why boiling cannot remove nitrate or lead.
Grade 9 Lab / experiment
Ivelstone Storm Kit: How Stored Tap Water Loses Its Chlorine
Students store tap water four ways, track free and total chlorine with test strips for two days, and turn the results into storage rules for a storm kit.
Grade 9 Lab / experiment
Nethercote Service Lines: A Bench Test of Length and Flow
A grade 9 lab where students hold head constant and measure how tubing length and inner diameter change delivered flow, then apply the result to a fictional town.
Grade 10 Lab / experiment
Upwood Creek Chlorine Demand: A Dose and Residual Lab
Grade 10 students dose four water samples that carry increasing amounts of leaf matter, measure the free chlorine left after 15 minutes, and calculate chlorine demand.
Grade 12 Lab / experiment
Thermal Plume Mixing at the Kelverne Station Outfall
A grade 12 science lab in which students mix warm and cool water at three ratios, predict each final temperature with an energy balance, and test the prediction.
Grade 9 Lab / experiment
Verrin River Thermal Mixing: Heat, Equilibrium, and Oxygen
A grade 9 lab where students mix warm and cold water to find equilibrium temperature, modeling a power plant's thermal mixing zone and its effect on dissolved oxygen.
Grade 9 Lab / experiment
Clearing Muddy Water: A Coagulation and Settling Lab
A grade 9 lab where students compare how muddy water clears with and without a coagulant, rating cloudiness over time and linking their results to real treatment plants.
Grade 9 Lab / experiment
Salt, Conductivity, and Dissolved Solids: A Grade 9 Water Lab
A grade 9 lab where students test how dissolved salt changes water's electrical conductivity, then link the result to dissolved solids and reverse osmosis.
Grade 10 Lab / experiment
Comparing Column Filter Media: A Grade 10 Turbidity Design Lab
A grade 10 engineering lab where students build column filters, change the media, and test which design clears cloudy water best while keeping an acceptable flow rate.
Classroom activities
Grade 9 Classroom activity
Tanbury Water Lab: A Grade 9 Bench Technician Rotation
A grade 9 careers rotation through four benches of a fictional water laboratory, where student teams run turbidity, chlorine feed, reporting, and duplicate-check math.
Quizzes & test questions
Grade 12 Quiz & test questions
Calderwyn Regional Water: Distribution Operator Exam Review
A grade 12 careers assessment on distribution licensing and operator exam math at a fictional district, with ten items and a fully worked key.
Grade 9 Quiz & test questions
Osterlin Water Lab: A Water Quality Analyst Certification Quiz
A 40-point grade 9 careers quiz on the laboratory analyst's job at a fictional certified water lab, covering titrations, dilutions, quality control, and custody records.
Grade 10 Quiz & test questions
Stonebridge Falls Chlorination Quiz: Dose, Demand, and pH
A grade 10 quiz mixing multiple-choice, short-answer, and computation items on chlorine dosing, chlorine demand, and pH for a fictional town's treatment plant.
Grade 12 Quiz & test questions
Kelverton Well 3 PFAS Compliance: Averages and Precision
A grade 12 quiz on PFAS compliance math: the running annual average, comparison to the 4.0 ppt limit, blending, reporting precision, and the rule's compliance timeline.
Grade 12 Quiz & test questions
Brockhurst Plant: Disinfection and Treatment Unit Test
A grade 12 unit test with multiple-choice, short-answer, and computation items on turbidity, chlorine dosing, removal efficiency, and detention time.
Grade 9 Quiz & test questions
Sable Point Water System: Treatment and Hydraulics Test
A grade 9 engineering unit test worth 30 points, mixing multiple-choice, short-answer, and computation items on head, pressure, flow, detention, filters, and removal.
Grade 10 Quiz & test questions
Quarrywood Plant Operations: A Grade 10 Conversions Unit Test
A grade 10 math unit test on a fictional plant: multiple-choice and computation items on the pounds formula, basin volume, detention time, and conversions.
Grade 12 Quiz & test questions
Sourwood Plant Certification Exam: Multi-Step Operator Math Practice
A grade 12 certification-style practice exam covering chained unit conversions, the pounds formula, tank volume, and detention time for a fictional treatment plant.
Grade 10 Quiz & test questions
Lake Everhart Raw Water Chemistry and Testing Assessment
A grade 10 chemistry assessment mixing multiple-choice, short-answer, and computation items on pH, dissolved oxygen, and water's solvent properties.