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Open Up - Grade 7 - Mathematics - Unit 4 - Lesson 14

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Last updated about 3 years ago
9 Questions

A student estimated that it would take 3 hours to write a book report, but it actually took her 5 hours.

What is the percent error for her estimate?

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A radar gun measured the speed of a baseball at 103 miles per hour.

If the baseball was actually going 102.8 miles per hour, what was the percent error in this measurement?(Round so there are only a maxium of 2 values to the right of the decimal for the percentage.)

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It took 48 minutes to drive downtown. An app estimated it would be less than that.

If the error was 20%, what was the app’s estimate?(Round to the nearest tenth.)

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A farmer estimated that there were 25 gallons of water left in a tank.

If this is an underestimate by 16%, how much water was actually in the tank?(Round to the nearest tenth.)

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For each story, write an equation that describes the relationship between the two quantities.

Diego collected x kg of recycling. Lin collected
more than that.

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For each story, write an equation that describes the relationship between the two quantities.

Lin biked x km. Diego biked
less than that.

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For each story, write an equation that describes the relationship between the two quantities.

Diego read for x minutes. Lin read
of that.

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For each diagram, decide if y is an increase or a decrease of x. Then determine the percentage.

  • 80%
  • Increase
  • Decrease
  • 20%
  • 40%
  • 60%
  • Diagram A.
  • Diagram B.
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Lin is making a window covering for a window that has the shape of a half circle on top of a square of side length 3 feet.

How much fabric does she need?(Round to the nearest tenth.)

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