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Water Quality: Calibrate the Lab

Find proportional constants in water-quality lab tables, graphs, equations, diagrams, and descriptions.

Grade 7MathInteractive · Printable

Aligned to7.RP.A.2.b

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What’s included

Single worksheet
Auto-graded online
1 Common Core standard
Printable answer key
14 questions
Classroom-ready

Details

Format: Interactive · Printable
Grade: Grade 7
Subject: Math
Question types: Fill in the blank, Multiple choice, Circle the answer, Short answer

About this worksheet

What students practice

Students find the constant of proportionality in tables, graphs, equations, diagrams, and descriptions.
Students interpret proportional constants using the quantities and units in a water-quality lab.

How to use

Use after introducing y = kx. Have students label the units of each constant, then discuss the final error-analysis question.

Curriculum

Common Core standard covered

7.RP.A.2.b

Find the constant of proportionality in tables, graphs, equations, diagrams, and word descriptions.

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Water Quality: Calibrate the Lab

Find and interpret proportional constants in a community science lab.

Prepare the Samples

Each relationship is proportional. Use y = kx and pay attention to which quantity is x.

Volunteers use this diagram to prepare equal portions of a water sample. Let x be the number of portions and y be their total volume.
1 portion: [18 mL]
3 portions: [18 mL] [18 mL] [18 mL]
Which statement identifies k and its meaning?