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Swim Practice: Changes and Gaps worksheet preview

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Swim Practice: Changes and Gaps

Analyze swimming practice records using subtraction as adding the opposite and absolute differences as distances.

Grade 7MathInteractive · Printable

Aligned to7.NS.A.1.c

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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 rewrite subtraction of rational numbers as addition of the opposite.
  • Students find distances between rational numbers using absolute differences.
  • Students distinguish signed changes from distances in swimming practice records.

How to use

Use after introducing signed rational numbers. Have students show subtraction rewrites and compare signed changes with nonnegative distances.

Curriculum

Common Core standard covered

7.NS.A.1.c

Understand subtracting as adding the opposite, and see the distance between two numbers as the absolute value of their difference.

Preview

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Name Date

Swim Practice: Changes and Gaps

Use opposites and absolute differences to analyze practice records.

Subtract Practice Records

A time deviation is the recorded time minus the target time. Negative means faster than the target; positive means slower. Show your work.

1.
Noor compares two time deviations using −2.5 − (−1.5). Which addition expression is equivalent?
  • A. 2.5 + 1.5
  • B. 2.5 + (−1.5)
  • C. −2.5 + (−1.5)
  • D. −2.5 + 1.5
2.
A lap balance is completed laps minus planned laps. Eli's balance was +3 laps on Monday and −4 laps on Tuesday.

Find Tuesday's balance minus Monday's balance: −4 − 3 =   laps

3.
Two practice swims have time deviations of +1.25 seconds and −0.75 second.

Find the first deviation minus the second: 1.25 − (−0.75) =   seconds

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