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Common Core: 4th Grade Math : Apply Area and Perimeter Formulas for Rectangles: CCSS.Math.Content.4.MD.A.3

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

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All Common Core: 4th Grade Math Resources

7 Diagnostic Tests 189 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #21 : How To Find Perimeter

What is the length of a rectangular room with a perimeter of 50ft and a width of 7ft?

Possible Answers:

36ft

28ft

20ft

18ft

14ft

Correct answer:

18ft

Explanation:

P=2l+ 2w

We have the perimeter and the width, so we can plug those values into our equation and solve for our unknown.

50=2l+2(7)

50=2l+14

Subtract from both sides

50-14=2l+14-14

36=2l

Divide by both sides

$\frac{36}{2}=\frac{2l}{2}$

18=l

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Example Question #141 : Quadrilaterals

What is the length of a rectangular room with an area of 56ft^2 and a width of 7ft?

Possible Answers:

7ft

9ft

8ft

5ft

6ft

Correct answer:

8ft

Explanation:

$A=l\times w$

We have the area and the width, so we can plug those values into our equation and solve for our unknown.

$56=l\times 7$

$\frac{56}{7}=\frac{l\times 7}{7}$

8=l

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Example Question #61 : Parallelograms

What is the length of a rectangular room with an area of 80ft^2 and a width of 8ft?

Possible Answers:

20ft

8ft

10ft

18ft

16ft

Correct answer:

10ft

Explanation:

$A=l\times w$

We have the area and the width, so we can plug those values into our equation and solve for our unknown.

$80=l\times 8$

$\frac{80}{8}=\frac{l\times 8}{8}$

10=l

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Example Question #71 : Parallelograms

What is the length of a rectangular room with an area of 100ft^2 and a width of 5ft?

Possible Answers:

20ft

15ft

10ft

25ft

30ft

Correct answer:

20ft

Explanation:

$A=l\times w$

We have the area and the width, so we can plug those values into our equation and solve for our unknown.

$100=l\times 5$

$\frac{100}{5}=\frac{l\times 5}{5}$

20=l

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Example Question #72 : Parallelograms

What is the length of a rectangular room with an area of 120ft^2 and a width of 10ft?

Possible Answers:

11ft

9ft

12ft

14ft

8ft

Correct answer:

12ft

Explanation:

$A=l\times w$

We have the area and the width, so we can plug those values into our equation and solve for our unknown.

$120=l\times 10$

$\frac{120}{10}=\frac{l\times 10}{10}$

12=l

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Example Question #72 : Parallelograms

What is the length of a rectangular room with an area of 48ft^2 and a width of 8ft?

Possible Answers:

7ft

8ft

5ft

6ft

9ft

Correct answer:

6ft

Explanation:

$A=l\times w$

We have the area and the width, so we can plug those values into our equation and solve for our unknown.

$48=l\times 8$

$\frac{48}{8}=\frac{l\times 8}{8}$

6=l

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Example Question #151 : Plane Geometry

What is the length of a rectangular room with an area of 99ft^2 and a width of 9ft?

Possible Answers:

9ft

10ft

8ft

11ft

7ft

Correct answer:

11ft

Explanation:

$A=l\times w$

We have the area and the width, so we can plug those values into our equation and solve for our unknown.

$99=l\times 9$

$\frac{99}{9}=\frac{l\times 9}{9}$

11=l

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Example Question #102 : Solve Problems Involving Measurement And Conversion Of Measurements

What is the length of a rectangular room with an area of 72ft^2 and a width of 8ft?

Possible Answers:

10ft

9ft

12ft

13ft

11ft

Correct answer:

9ft

Explanation:

$A=l\times w$

We have the area and the width, so we can plug those values into our equation and solve for our unknown.

$72=l\times 8$

$\frac{72}{8}=\frac{l\times 8}{8}$

9=l

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Example Question #152 : Plane Geometry

What is the length of a rectangular room with an area of 80ft^2 and a width of 8ft?

Possible Answers:

6ft

10ft

9ft

8ft

7ft

Correct answer:

10ft

Explanation:

$A=l\times w$

We have the area and the width, so we can plug those values into our equation and solve for our unknown.

$80=l\times 8$

$\frac{80}{8}=\frac{l\times 8}{8}$

10=l

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Example Question #51 : How To Find The Area Of A Rectangle

What is the length of a rectangular room with an area of 42ft^2 and a width of 7ft?

Possible Answers:

7ft

8ft

4ft

5ft

6ft

Correct answer:

6ft

Explanation:

$A=l\times w$

We have the area and the width, so we can plug those values into our equation and solve for our unknown.

$42=l\times 7$

$\frac{42}{7}=\frac{l\times 7}{7}$

6=l

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All Common Core: 4th Grade Math Resources

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Common Core: 4th Grade Math : Apply Area and Perimeter Formulas for Rectangles: CCSS.Math.Content.4.MD.A.3

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

All Common Core: 4th Grade Math Resources

Example Questions

Example Question #21 : How To Find Perimeter

Example Question #141 : Quadrilaterals

Example Question #61 : Parallelograms

Example Question #71 : Parallelograms

Example Question #72 : Parallelograms

Example Question #72 : Parallelograms

Example Question #151 : Plane Geometry

Example Question #102 : Solve Problems Involving Measurement And Conversion Of Measurements

Example Question #152 : Plane Geometry

Example Question #51 : How To Find The Area Of A Rectangle

All Common Core: 4th Grade Math Resources

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