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Tide-Pool Surveys: Compare Species Counts worksheet preview

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Tide-Pool Surveys: Compare Species Counts

Build equivalent-ratio tables and plot species-count pairs to compare observations from a marine biology field trip.

Grade 6MathInteractive · Printable

Aligned to6.RP.A.3.a

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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 6
Subject
Math
Question types
Fill in the blank, Multiple choice, Short answer, Drawing

About this worksheet

What students practice

  • Students build tables of equivalent ratios and find missing species counts.
  • Students plot ratio pairs on a coordinate plane with clearly labeled axes.
  • Students compare species-count ratios using tables and graphs.

How to use

Have students complete the tables before plotting their pairs. Discuss how comparing equal counts of one species makes different ratios easier to compare.

Curriculum

Common Core standard covered

6.RP.A.3.a

Build tables of equivalent ratios, find missing values, and plot the pairs on a coordinate plane to compare ratios.

Preview

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Name Date

Tide-Pool Surveys: Compare Species Counts

Use ratio tables and coordinate graphs to compare field observations.

Organize the Field Notes

Use equivalent ratios. Predicted counts in these models keep the observed ratio; real tide-pool counts may vary.

1.
At Cove A, students observe 3 shore snails for every 2 hermit crabs. Complete the missing counts using that ratio.
Cove A Ratio Model
Shore snailsHermit crabs
32
6?
9?
18?

With 6 snails:   crabs. With 9 snails:   crabs. With 18 snails:   crabs.

2.
Amira records 10 hermit crabs in a sample. If the sample has Cove A's ratio of 3 shore snails to 2 hermit crabs, how many shore snails does it contain?

  shore snails

3.
Which row does NOT belong in a table of ratios equivalent to 3 shore snails : 2 hermit crabs?
  • A. 12 shore snails : 8 hermit crabs
  • B. 21 shore snails : 14 hermit crabs
  • C. 9 shore snails : 8 hermit crabs
  • D. 24 shore snails : 16 hermit crabs

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