Common Core: 3rd Grade Math : Use Multiplication to Find Area of a Rectangle: CCSS.Math.Content.3.MD.C.7a

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

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Example Questions

Example Question #36 : Geometric Measurement: Understanding Concepts Of Area And Relating Area To Multiplication And To Addition

What is the area of the rectangle? 

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Possible Answers:

\(\displaystyle 18cm^2\)

\(\displaystyle 16cm^2\)

\(\displaystyle 17cm^2\)

\(\displaystyle 15cm^2\)

\(\displaystyle 14cm^2\)

Correct answer:

\(\displaystyle 18cm^2\)

Explanation:

We can find the area by counting the squares within the rectangle. There are \(\displaystyle 18\) squares. 

We can also multiply the length and the width to find the area. 

\(\displaystyle 3\times6=18cm^2\)

*Area is the number of square units inside a shape, which is why area is always written with square units. 

Example Question #32 : Geometric Measurement: Understanding Concepts Of Area And Relating Area To Multiplication And To Addition

What is the area of the rectangle? 

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Possible Answers:

\(\displaystyle 23cm^2\)

\(\displaystyle 26cm^2\)

\(\displaystyle 24cm^2\)

\(\displaystyle 21cm^2\)

\(\displaystyle 22cm^2\)

Correct answer:

\(\displaystyle 21cm^2\)

Explanation:

We can find the area by counting the squares within the rectangle. There are \(\displaystyle 21\) squares. 

We can also multiply the length and the width to find the area. 

\(\displaystyle 3\times7=21cm^2\)

*Area is the number of square units inside a shape, which is why area is always written with square units. 

Example Question #91 : How To Find The Area Of A Rectangle

What is the area of the rectangle? 


Screen shot 2015 09 28 at 1.01.36 pm

Possible Answers:

\(\displaystyle 50cm^2\)

\(\displaystyle 46cm^2\)

\(\displaystyle 49cm^2\)

\(\displaystyle 48m^2\)

\(\displaystyle 47cm^2\)

Correct answer:

\(\displaystyle 49cm^2\)

Explanation:

We can find the area by counting the squares within the rectangle. There are \(\displaystyle 49\) squares. 

We can also multiply the length and the width to find the area. 

\(\displaystyle 7\times7=49cm^2\)

*Area is the number of square units inside a shape, which is why area is always written with square units. 

Example Question #33 : Geometric Measurement: Understanding Concepts Of Area And Relating Area To Multiplication And To Addition

What is the area of the rectangle? 

Screen shot 2015 09 28 at 1.00.26 pm

Possible Answers:

\(\displaystyle 45cm^2\)

\(\displaystyle 41cm^2\)

\(\displaystyle 43cm^2\)

\(\displaystyle 42cm^2\)

\(\displaystyle 44cm^2\)

Correct answer:

\(\displaystyle 42cm^2\)

Explanation:

We can find the area by counting the squares within the rectangle. There are \(\displaystyle 42\) squares. 

We can also multiply the length and the width to find the area. 

\(\displaystyle 7\times6=42cm^2\)

*Area is the number of square units inside a shape, which is why area is always written with square units. 

Example Question #91 : How To Find The Area Of A Rectangle

What is the area of the rectangle? 

Screen shot 2015 09 28 at 12.59.49 pm

Possible Answers:

\(\displaystyle 34cm^2\)

\(\displaystyle 37cm^2\)

\(\displaystyle 36cm^2\)

\(\displaystyle 33cm^2\)

\(\displaystyle 35cm^2\)

Correct answer:

\(\displaystyle 35cm^2\)

Explanation:

We can find the area by counting the squares within the rectangle. There are \(\displaystyle 35\) squares. 

We can also multiply the length and the width to find the area. 

\(\displaystyle 7\times5=35cm^2\)

*Area is the number of square units inside a shape, which is why area is always written with square units. 

Example Question #5 : Use Multiplication To Find Area Of A Rectangle: Ccss.Math.Content.3.Md.C.7a

What is the area of the rectangle? 


Screen shot 2015 09 28 at 12.57.35 pm

Possible Answers:

\(\displaystyle 31cm^2\)

\(\displaystyle 34cm^2\)

\(\displaystyle 32cm^2\)

\(\displaystyle 33cm^2\)

\(\displaystyle 30cm^2\)

Correct answer:

\(\displaystyle 30cm^2\)

Explanation:

We can find the area by counting the squares within the rectangle. There are \(\displaystyle 30\) squares. 

We can also multiply the length and the width to find the area. 

\(\displaystyle 6\times5=30cm^2\)

*Area is the number of square units inside a shape, which is why area is always written with square units. 

Example Question #211 : Measurement & Data

What is the area of the rectangle? 

Screen shot 2015 09 28 at 12.57.08 pm

Possible Answers:

\(\displaystyle 24cm^2\)

\(\displaystyle 22cm^2\)

\(\displaystyle 25cm^2\)

\(\displaystyle 21cm^2\)

\(\displaystyle 23cm^2\)

Correct answer:

\(\displaystyle 25cm^2\)

Explanation:

We can find the area by counting the squares within the rectangle. There are \(\displaystyle 25\) squares. 

We can also multiply the length and the width to find the area. 

\(\displaystyle 5\times5=25cm^2\)

*Area is the number of square units inside a shape, which is why area is always written with square units. 

Example Question #95 : How To Find The Area Of A Rectangle

What is the area of the rectangle? 

Screen shot 2015 09 28 at 12.56.21 pm

Possible Answers:

\(\displaystyle 21cm^2\)

\(\displaystyle 18cm^2\)

\(\displaystyle 19cm^2\)

\(\displaystyle 17cm^2\)

\(\displaystyle 20cm^2\)

Correct answer:

\(\displaystyle 20cm^2\)

Explanation:

We can find the area by counting the squares within the rectangle. There are \(\displaystyle 20\) squares. 

We can also multiply the length and the width to find the area. 

\(\displaystyle 5\times4=20cm^2\)

*Area is the number of square units inside a shape, which is why area is always written with square units. 

Example Question #96 : How To Find The Area Of A Rectangle

What is the area of the rectangle? 

Screen shot 2015 09 28 at 12.55.27 pm

Possible Answers:

\(\displaystyle 14cm^2\)

\(\displaystyle 18cm^2\)

\(\displaystyle 15cm^2\)

\(\displaystyle 16cm^2\)

\(\displaystyle 17cm^2\)

Correct answer:

\(\displaystyle 15cm^2\)

Explanation:

We can find the area by counting the squares within the rectangle. There are \(\displaystyle 15\) squares. 

We can also multiply the length and the width to find the area. 

\(\displaystyle 5\times3=15cm^2\)

*Area is the number of square units inside a shape, which is why area is always written with square units. 

Example Question #97 : How To Find The Area Of A Rectangle

What is the area of the rectangle? 

Screen shot 2015 09 28 at 12.55.03 pm

Possible Answers:

\(\displaystyle 12cm^2\)

\(\displaystyle 13cm^2\)

\(\displaystyle 11cm^2\)

\(\displaystyle 14cm^2\)

\(\displaystyle 10cm^2\)

Correct answer:

\(\displaystyle 12cm^2\)

Explanation:

We can find the area by counting the squares within the rectangle. There are \(\displaystyle 12\) squares. 

We can also multiply the length and the width to find the area. 

\(\displaystyle 4\times3=12cm^2\)

*Area is the number of square units inside a shape, which is why area is always written with square units. 

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