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Tide-Pool Survey: Revising the Species Tally worksheet preview

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Tide-Pool Survey: Revising the Species Tally

Model signed addition on number lines, identify opposite corrections, and interpret species-count updates from a tide-pool field trip.

Grade 7MathInteractive · Printable

Aligned to7.NS.A.1.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, Matching, Short answer

About this worksheet

What students practice

  • Students model p + q by moving |q| units from p in the direction determined by the sign of q.
  • Students identify opposite signed corrections whose sum is zero.
  • Students interpret signed sums in tide-pool species-count records.

How to use

Use after introducing signed addition. Have students annotate the number lines and distinguish a signed correction from the actual number of species.

Curriculum

Common Core standard covered

7.NS.A.1.b

Understand p + q as moving |q| from p on a number line, see that opposites add to 0, and interpret sums in context.

Preview

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Tide-Pool Survey: Revising the Species Tally

Use signed sums to track species-count corrections and compare pools.

Model the Corrections

A field-trip team counts distinct species, not individual animals. Newly identified species increase a tally; duplicate species entries decrease it. A signed correction of 0 means no net change to the original tally.

1.
Match each sequence of tally corrections to its number-line model. Start at the first correction, then model the second correction.
  1. −3 + (−5)
  2. −3 + 5
  3. 5 + (−3)
  4. 3 + 5
  1. A. Start at −3; move 5 units right.
  2. B. Start at 3; move 5 units right.
  3. C. Start at −3; move 5 units left.
  4. D. Start at 5; move 3 units left.
2.
For the anemone-pool record, model −1 + (−6). Use the line to find the endpoint.−8−7−6−5−4−3−2−1012345678

What is the combined signed correction?   species

3.
A species-tally model starts at −9 and moves 6 units right. Which equation records this model?
  • A. −9 + 6 = 3
  • B. −9 + 6 = −3
  • C. 6 + (−9) = −3
  • D. −9 + (−6) = −15

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