Common Core: 3rd Grade Math : Find Perimeter or Missing Side Lengths of Polygons: CCSS.Math.Content.3.MD.D.8

Study concepts, example questions & explanations for Common Core: 3rd Grade Math

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Example Questions

Example Question #441 : Measurement & Data

What is the perimeter of the rectangle below? 

Screen shot 2015 09 29 at 8.31.53 am

Possible Answers:

\displaystyle 17in

\displaystyle 20in

\displaystyle 18in

\displaystyle 19in

\displaystyle 16in

Correct answer:

\displaystyle 20in

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the perimeter we can plug our known values into the equation. 

\displaystyle P=2(7+3)

\displaystyle P=2(10)

\displaystyle P=20

Example Question #2 : Geometric Measurement: Recognizing Perimeter

What is the perimeter of the rectangle below? 

Screen shot 2015 09 29 at 8.32.51 am

Possible Answers:

\displaystyle 24in

\displaystyle 26in

\displaystyle 27in

\displaystyle 28in

\displaystyle 25in

Correct answer:

\displaystyle 24in

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the perimeter we can plug our known values into the equation. 

\displaystyle P=2(7+5)

\displaystyle P=2(12)

\displaystyle P=24

Example Question #3 : Geometric Measurement: Recognizing Perimeter

What is the perimeter of the rectangle below? 

Screen shot 2015 09 29 at 8.31.30 am

Possible Answers:

\displaystyle 24in

\displaystyle 23in

\displaystyle 21in

\displaystyle 22in

\displaystyle 25in

Correct answer:

\displaystyle 24in

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the perimeter we can plug our known values into the equation. 

\displaystyle P=2(11+1)

\displaystyle P=2(12)

\displaystyle P=24

Example Question #1 : Geometric Measurement: Recognizing Perimeter

What is the perimeter of the rectangle below? 

Screen shot 2015 09 29 at 8.29.52 am

Possible Answers:

\displaystyle 39in

\displaystyle 40in

\displaystyle 41in

\displaystyle 38in

\displaystyle 37in

Correct answer:

\displaystyle 38in

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the perimeter we can plug our known values into the equation. 

\displaystyle P=2(11+8)

\displaystyle P=2(19)

\displaystyle P=38

Example Question #5 : Geometric Measurement: Recognizing Perimeter

What is the perimeter of the rectangle below? 


Screen shot 2015 09 29 at 8.29.29 am

Possible Answers:

\displaystyle 34in

\displaystyle 35in

\displaystyle 31in

\displaystyle 36in

\displaystyle 32in

Correct answer:

\displaystyle 34in

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the perimeter we can plug our known values into the equation. 

\displaystyle P=2(11+6)

\displaystyle P=2(17)

\displaystyle P=34

Example Question #4 : Geometric Measurement: Recognizing Perimeter

What is the perimeter of the rectangle below? 

Screen shot 2015 09 29 at 8.28.37 am

Possible Answers:

\displaystyle 30in

\displaystyle 32in

\displaystyle 31in

\displaystyle 33in

\displaystyle 34in

Correct answer:

\displaystyle 30in

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the perimeter we can plug our known values into the equation. 

\displaystyle P=2(9+6)

\displaystyle P=2(15)

\displaystyle P=30

Example Question #451 : Measurement & Data

What is the perimeter of the rectangle below? 


Screen shot 2015 09 29 at 8.27.30 am

Possible Answers:

\displaystyle 24in

\displaystyle 26in

\displaystyle 25in

\displaystyle 22in

\displaystyle 23in

Correct answer:

\displaystyle 26in

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the perimeter we can plug our known values into the equation. 

\displaystyle P=2(9+4)

\displaystyle P=2(13)

\displaystyle P=26

Example Question #8 : Geometric Measurement: Recognizing Perimeter

What is the perimeter of the rectangle below? 


Screen shot 2015 09 29 at 8.27.11 am

Possible Answers:

\displaystyle 32in

\displaystyle 33in

\displaystyle 34in

\displaystyle 35in

\displaystyle 31in

Correct answer:

\displaystyle 32in

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the perimeter we can plug our known values into the equation. 

\displaystyle P=2(12+4)

\displaystyle P=2(16)

\displaystyle P=32

Example Question #1351 : Isee Lower Level (Grades 5 6) Quantitative Reasoning

What is the perimeter of the rectangle below? 

Screen shot 2015 09 29 at 8.26.39 am

Possible Answers:

\displaystyle 36in

\displaystyle 38in

\displaystyle 40in

\displaystyle 39in

\displaystyle 41in

Correct answer:

\displaystyle 40in

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the perimeter we can plug our known values into the equation. 

\displaystyle P=2(12+8)

\displaystyle P=2(20)

\displaystyle P=40

Example Question #1352 : Isee Lower Level (Grades 5 6) Quantitative Reasoning

What is the perimeter of the rectangle below? 


Screen shot 2015 09 29 at 8.16.34 am

Possible Answers:

\displaystyle 35in

\displaystyle 34in

\displaystyle 37in

\displaystyle 36in

\displaystyle 38in

Correct answer:

\displaystyle 36in

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the perimeter we can plug our known values into the equation. 

\displaystyle P=2(10+8)

\displaystyle P=2(18)

\displaystyle P=36

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