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Animal Shelter: Signed Inventory worksheet preview

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Animal Shelter: Signed Inventory

Interpret signed products in animal shelter records and use patterns and number properties to explain multiplication rules.

Grade 7MathInteractive · Printable

Aligned to7.NS.A.2.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 7
Subject
Math
Question types
Fill in the blank, Multiple choice, Circle the answer, Short answer

About this worksheet

What students practice

  • Students interpret positive, negative, and zero products in shelter inventory records.
  • Students use patterns and number properties to justify the signs of products.
  • Students multiply signed whole numbers, fractions, and decimals in context.

How to use

Have students complete the inventory models independently, then discuss how negative factors affect a recorded change. Use the final explanation to assess reasoning.

Curriculum

Common Core standard covered

7.NS.A.2.a

Understand why multiplying signed numbers follows rules like (-1)(-1) = 1, and interpret products in context.

Preview

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Name Date

Animal Shelter: Signed Inventory

Use signed products to track adoptions and supplies.

Read the Records

A positive change adds to a recorded total. A negative change subtracts from it. Include the sign of each nonzero answer.

1.
The shelter uses these changes in its daily records.
Shelter Record Changes
EventChange per event
One animal adopted−1 animal
One food delivery+6 bags
One feeding shift−2 bags
Nine animals are adopted. What is the signed change in the number of animals at the shelter?

9 × (−1) =   animals

2.
An adoption entry changes the animal total by −1. A factor of −1 undoes that entry. Which statement interprets (−1) × (−1) = 1?
  • A. Undoing the entry removes two animals from the recorded total.
  • B. Undoing the entry adds two animals to the recorded total.
  • C. Undoing the entry adds one animal to the recorded total.
  • D. Undoing the entry subtracts one animal from the recorded total.
3.
A spreadsheet multiplies a signed number of feeding shifts by −2 bags per shift. Continue the pattern through zero.
Feeding-Shift Pattern
Signed shiftsProduct (bags)
3−6
2−4
1−2
00
−1?
−2?

(−1) × (−2) =   bags; (−2) × (−2) =   bags

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