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Common Core: 4th Grade Math : Solving for Length

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 #51 : Solving For Length

What is the length of a rectangular yard with an area of 16m^2 $\displaystyle 16m^2$ and a width of 2m? $\displaystyle 2m?$

Possible Answers:

$\displaystyle 5m$

$\displaystyle 7m$

$\displaystyle 6m$

$\displaystyle 8m$

$\displaystyle 9m$

Correct answer:

$\displaystyle 8m$

Explanation:

$A=l\times w$ $\displaystyle A=l\times w$

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

$16=l\times 2$ $\displaystyle 16=l\times 2$

$\frac{16}{2}=\frac{l\times 2}{2}$ $\displaystyle \frac{16}{2}=\frac{l\times 2}{2}$

8=l $\displaystyle 8=l$

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Example Question #52 : Solving For Length

What is the length of a rectangular yard with an area of 20m^2 $\displaystyle 20m^2$ and a width of 5m? $\displaystyle 5m?$

Possible Answers:

$\displaystyle 3m$

$\displaystyle 1m$

$\displaystyle 2m$

$\displaystyle 5m$

$\displaystyle 4m$

Correct answer:

$\displaystyle 4m$

Explanation:

$A=l\times w$ $\displaystyle A=l\times w$

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

$20=l\times 5$ $\displaystyle 20=l\times 5$

$\frac{20}{5}=\frac{l\times 5}{5}$ $\displaystyle \frac{20}{5}=\frac{l\times 5}{5}$

4=l $\displaystyle 4=l$

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Example Question #85 : How To Find The Area Of A Rectangle

What is the length of a rectangular yard with an area of 24m^2 $\displaystyle 24m^2$ and a width of 4m? $\displaystyle 4m?$

Possible Answers:

$\displaystyle 6m$

$\displaystyle 7m$

$\displaystyle 8m$

10m $\displaystyle 10m$

$\displaystyle 9m$

Correct answer:

$\displaystyle 6m$

Explanation:

$A=l\times w$ $\displaystyle A=l\times w$

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

$24=l\times 4$ $\displaystyle 24=l\times 4$

$\frac{24}{4}=\frac{l\times 4}{4}$ $\displaystyle \frac{24}{4}=\frac{l\times 4}{4}$

6=l $\displaystyle 6=l$

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Example Question #121 : Plane Geometry

What is the length of a rectangular yard with an area of 25m^2 $\displaystyle 25m^2$ and a width of 5m? $\displaystyle 5m?$

Possible Answers:

$\displaystyle 8m$

$\displaystyle 6m$

$\displaystyle 4m$

$\displaystyle 5m$

$\displaystyle 7m$

Correct answer:

$\displaystyle 5m$

Explanation:

$A=l\times w$ $\displaystyle A=l\times w$

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

$25=l\times 5$ $\displaystyle 25=l\times 5$

$\frac{25}{5}=\frac{l\times 5}{5}$ $\displaystyle \frac{25}{5}=\frac{l\times 5}{5}$

5=l $\displaystyle 5=l$

Report an Error

Example Question #192 : Geometry

What is the length of a rectangular yard with an area of 27m^2 $\displaystyle 27m^2$ and a width of 3m? $\displaystyle 3m?$

Possible Answers:

$\displaystyle 7m$

$\displaystyle 9m$

10m $\displaystyle 10m$

$\displaystyle 8m$

11m $\displaystyle 11m$

Correct answer:

$\displaystyle 9m$

Explanation:

$A=l\times w$ $\displaystyle A=l\times w$

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

$27=l\times 3$ $\displaystyle 27=l\times 3$

$\frac{27}{3}=\frac{l\times 3}{3}$ $\displaystyle \frac{27}{3}=\frac{l\times 3}{3}$

9=l $\displaystyle 9=l$

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Example Question #88 : How To Find The Area Of A Rectangle

What is the length of a rectangular yard with an area of 28m^2 $\displaystyle 28m^2$ and a width of 4m? $\displaystyle 4m?$

Possible Answers:

$\displaystyle 5m$

$\displaystyle 8m$

$\displaystyle 7m$

$\displaystyle 6m$

$\displaystyle 4m$

Correct answer:

$\displaystyle 7m$

Explanation:

$A=l\times w$ $\displaystyle A=l\times w$

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

$28=l\times 4$ $\displaystyle 28=l\times 4$

$\frac{28}{4}=\frac{l\times 4}{4}$ $\displaystyle \frac{28}{4}=\frac{l\times 4}{4}$

7=l $\displaystyle 7=l$

Report an Error

Example Question #191 : Plane Geometry

What is the length of a rectangular yard with an area of 30m^2 $\displaystyle 30m^2$ and a width of 5m? $\displaystyle 5m?$

Possible Answers:

$\displaystyle 3m$

$\displaystyle 2m$

$\displaystyle 6m$

$\displaystyle 4m$

$\displaystyle 5m$

Correct answer:

$\displaystyle 6m$

Explanation:

$A=l\times w$ $\displaystyle A=l\times w$

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

$30=l\times 5$ $\displaystyle 30=l\times 5$

$\frac{30}{5}=\frac{l\times 5}{5}$ $\displaystyle \frac{30}{5}=\frac{l\times 5}{5}$

6=l $\displaystyle 6=l$

Report an Error

Example Question #90 : How To Find The Area Of A Rectangle

What is the length of a rectangular yard with an area of 32m^2 $\displaystyle 32m^2$ and a width of 4m? $\displaystyle 4m?$

Possible Answers:

13m $\displaystyle 13m$

$\displaystyle 8m$

$\displaystyle 9m$

12m $\displaystyle 12m$

10m $\displaystyle 10m$

Correct answer:

$\displaystyle 8m$

Explanation:

$A=l\times w$ $\displaystyle A=l\times w$

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

$32=l\times 4$ $\displaystyle 32=l\times 4$

$\frac{32}{4}=\frac{l\times 4}{4}$ $\displaystyle \frac{32}{4}=\frac{l\times 4}{4}$

8=l $\displaystyle 8=l$

Report an Error

Example Question #53 : Solving For Length

What is the length of a rectangular yard with an area of 33m^2 $\displaystyle 33m^2$ and a width of 3m? $\displaystyle 3m?$

Possible Answers:

12m $\displaystyle 12m$

$\displaystyle 9m$

11m $\displaystyle 11m$

10m $\displaystyle 10m$

$\displaystyle 8m$

Correct answer:

11m $\displaystyle 11m$

Explanation:

$A=l\times w$ $\displaystyle A=l\times w$

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

$33=l\times 3$ $\displaystyle 33=l\times 3$

$\frac{33}{3}=\frac{l\times 3}{3}$ $\displaystyle \frac{33}{3}=\frac{l\times 3}{3}$

11=l $\displaystyle 11=l$

Report an Error

Example Question #231 : Geometry

What is the length of a rectangular yard with an area of 35m^2 $\displaystyle 35m^2$ and a width of 5m? $\displaystyle 5m?$

Possible Answers:

$\displaystyle 9m$

10m $\displaystyle 10m$

$\displaystyle 8m$

11m $\displaystyle 11m$

$\displaystyle 7m$

Correct answer:

$\displaystyle 7m$

Explanation:

$A=l\times w$ $\displaystyle A=l\times w$

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

$35=l\times 5$ $\displaystyle 35=l\times 5$

$\frac{35}{5}=\frac{l\times 5}{5}$ $\displaystyle \frac{35}{5}=\frac{l\times 5}{5}$

7=l $\displaystyle 7=l$

Report an Error

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Common Core: 4th Grade Math : Solving for Length

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

All Common Core: 4th Grade Math Resources

Example Questions

Example Question #51 : Solving For Length

Example Question #52 : Solving For Length

Example Question #85 : How To Find The Area Of A Rectangle

Example Question #121 : Plane Geometry

Example Question #192 : Geometry

Example Question #88 : How To Find The Area Of A Rectangle

Example Question #191 : Plane Geometry

Example Question #90 : How To Find The Area Of A Rectangle

Example Question #53 : Solving For Length

Example Question #231 : Geometry

All Common Core: 4th Grade Math Resources

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