Common Core: 4th Grade Math : Solving for Perimeter

Study concepts, example questions & explanations for Common Core: 4th Grade Math

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Example Questions

Example Question #511 : Rectangles

David wants to put a fence around his backyard. How much fencing will he need if his backyard is \displaystyle 8ft by \displaystyle 4ft?

 

Possible Answers:

\displaystyle 26ft

\displaystyle 22ft

\displaystyle 23ft

\displaystyle 25ft

\displaystyle 24ft

Correct answer:

\displaystyle 24ft

Explanation:

The fence is going around the backyard, so this is a perimeter problem. 

\displaystyle P=2l+2w

\displaystyle P=2(8)+2(4)

\displaystyle P=16+8

\displaystyle P=24

Example Question #512 : Rectangles

David wants to put a fence around his backyard. How much fencing will he need if his backyard is \displaystyle 8ft by \displaystyle 2ft?

 

Possible Answers:

\displaystyle 20ft

\displaystyle 19ft

\displaystyle 21ft

\displaystyle 23ft

\displaystyle 22ft

Correct answer:

\displaystyle 20ft

Explanation:

The fence is going around the backyard, so this is a perimeter problem. 

\displaystyle P=2l+2w

\displaystyle P=2(8)+2(2)

\displaystyle P=16+4

\displaystyle P=20

Example Question #513 : Rectangles

David wants to put a fence around his backyard. How much fencing will he need if his backyard is \displaystyle 4ft by \displaystyle 3ft?

 

Possible Answers:

\displaystyle 15ft

\displaystyle 18ft

\displaystyle 17ft

\displaystyle 14ft

\displaystyle 16ft

Correct answer:

\displaystyle 14ft

Explanation:

The fence is going around the backyard, so this is a perimeter problem. 

\displaystyle P=2l+2w

\displaystyle P=2(4)+2(3)

\displaystyle P=8+6

\displaystyle P=14

Example Question #514 : Rectangles

David wants to put a fence around his backyard. How much fencing will he need if his backyard is \displaystyle 10ft by \displaystyle 9ft?

 

Possible Answers:

\displaystyle 36ft

\displaystyle 35ft

\displaystyle 34ft

\displaystyle 37ft

\displaystyle 38ft

Correct answer:

\displaystyle 38ft

Explanation:

The fence is going around the backyard, so this is a perimeter problem. 

\displaystyle P=2l+2w

\displaystyle P=2(10)+2(9)

\displaystyle P=20+18

\displaystyle P=38

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