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

Last updated 9 months ago

9 questions

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?

1

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.)

1

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.)

1

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.)

1

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.

1

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

Lin biked x km. Diego biked
less than that.

1

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

Diego read for x minutes. Lin read
of that.

1

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

40%
80%
60%
20%
Decrease
Increase

Diagram A.
Diagram B.

1

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.)

"Source: Open Up Resouces (Download for free at openupresources.org.)"