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Tide-Pool Survey: What the Signs Mean worksheet preview

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Tide-Pool Survey: What the Signs Mean

Interpret positive numbers, negative numbers, and zero in tide-pool count changes, survey locations, and species-count comparisons.

Grade 6MathInteractive · Printable

Aligned to6.NS.C.5

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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, Matching, Short answer

About this worksheet

What students practice

  • Students use signed numbers to represent increases and decreases in observed counts.
  • Students interpret positive and negative numbers relative to a stated reference.
  • Students explain what zero means in survey changes, locations, and comparisons.

How to use

Have students identify the reference quantity before answering each section. Discuss why a zero change does not mean that no organisms were observed.

Curriculum

Common Core standard covered

6.NS.C.5

Use positive and negative numbers for opposite quantities like above/below zero or gains/losses, and explain what 0 means there.

Preview

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Name Date

Tide-Pool Survey: What the Signs Mean

Use signed numbers to describe observations and explain the meaning of zero.

Changes in Observed Counts

A marine biology class counts organisms without collecting them. Positive changes mean more individuals were observed on the second count; negative changes mean fewer. Zero means no change. Use a minus sign for negative answers.

1.
Leila observes 7 more limpets on the second count than on the first count.

Write the signed change:   limpets

2.
Omar observes 4 fewer shore crabs on the second count than on the first count.

Write the signed change:   shore crabs

3.
A record shows a change of −6 sea snails. What does this record mean?
  • A. The second count included exactly 6 sea snails.
  • B. The second count included 6 more sea snails.
  • C. The second count included 6 fewer sea snails.
  • D. The first count included exactly 6 sea snails.

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