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Tide-Pool Counts: What the Points Mean

Interpret tide-pool counting graphs, including the origin, unit-rate points, and points with reversed axis meanings.

Grade 7MathInteractive · Printable

Aligned to7.RP.A.2.d

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What’s included

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

Details

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

About this worksheet

What students practice

Students explain what points on proportional graphs mean using quantities and units.
Students interpret the origin and the point (1, r) in species-counting models.
Students distinguish unit rates when the quantities on the axes are reversed.

How to use

Have students label the quantities in each ordered pair before answering. Discuss why a counting model does not describe every tide pool.

Curriculum

Common Core standard covered

7.RP.A.2.d

Explain what a point (x, y) on a proportional graph means in context, especially (0, 0) and (1, r) where r is the unit rate.

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Tide-Pool Counts: What the Points Mean

Interpret proportional graphs from a marine biology field trip.

Limpet Survey

A quadrat is a square frame used to mark a sampling area. The graph models a count of 2 limpets per quadrat. Use this model, not a prediction about every real tide pool.