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Aquarium Care: Efficient Feeding Calculations worksheet preview

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Aquarium Care: Efficient Feeding Calculations

Use compensation, regrouping, and subtraction strategies to simplify rational-number calculations in aquarium feeding records.

Grade 7MathInteractive · Printable

Aligned to7.NS.A.1.d

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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, Sorting, Short answer

About this worksheet

What students practice

  • Students use compensation and regrouping to add and subtract rational numbers.
  • Students rewrite subtraction expressions without changing their values.
  • Students apply efficient calculation strategies to feeding amounts and signed schedule adjustments.

How to use

Have students mark helpful groups or equivalent expressions before calculating. Discuss why compensation works differently for a sum and a difference.

Curriculum

Common Core standard covered

7.NS.A.1.d

Use properties of operations as strategies to add and subtract rational numbers.

Preview

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Name Date

Aquarium Care: Efficient Feeding Calculations

Use equivalent expressions to simplify feeding and tank-care records.

Choose an Efficient Strategy

Complete or choose equivalent calculations. Keep the sign attached to each number when regrouping.

1.
An aquarium worker simplifies a food-stock calculation by changing −2.9 to −3. Complete the matching adjustment so the sum stays the same.

6.8 + (−2.9) = (6.8 +  ) + (−3)

2.
A feeder has 12.4 g of food before dispensing 3.9 g. Which calculation uses compensation to find the remaining amount without changing the difference?
  • A. Use 12.5 − 3.8.
  • B. Use 12.4 − 4.0.
  • C. Use 12.5 − 4.0.
  • D. Use 12.3 − 4.0.
3.
A food portion calculation is 4 1/6 − 1/6 − 2/3 grams. Which rewrite correctly groups the two amounts being subtracted?
  • A. 4 1/6 + (1/6 − 2/3)
  • B. 4 1/6 − (1/6 − 2/3)
  • C. 4 1/6 + (1/6 + 2/3)
  • D. 4 1/6 − (1/6 + 2/3)

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