Open Up - Grade 7 - Mathematics - Unit 4 - Lesson 14
By Formative Library
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Last updated about 2 years ago
9 Questions
1
1.
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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2.
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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3.
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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4.
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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5.
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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6.
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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7.
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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8.
For each diagram, decide if y is an increase or a decrease of x. Then determine the percentage.
- 20%
- 40%
- 80%
- Decrease
- 60%
- Increase
- Diagram A.
- Diagram B.
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9.
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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