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ISEE Lower Level Math : How to find the area of a rectangle

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10 Diagnostic Tests 170 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #11 : How To Find The Area Of A Rectangle

Joe has a rectangular poster that is 3 feet long and 2 feet wide. What is the area of the poster?

Possible Answers:

$10\ \text{ft}^2$

$6\ \text{ft}^2$

$4\ \text{ft}^2$

$5\ \text{ft}^2$

$8\ \text{ft}^2$

Correct answer:

$6\ \text{ft}^2$

Explanation:

The area of a rectangle is found by multiping the length times the width. Given that the length is 3 feet, the width is 2 feet, the total cubic area would be found using this equation:

$\text{length}\times \text{width} = \text{area}$

Here is the equation with the appropriate numbers plugged in from the question:

$3\ \text{ft}\times2\ \text{ft}=6\ \text{ft}^2$

6 square feet, or $6\ \text{ft}^2$ is the correct answer.

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Example Question #12 : How To Find The Area Of A Rectangle

Leslie has a blanket that is $14\ \text{ft}^2$ in area. Jen has a blanket that is half the size of Leslie's blanket. How big is Jen's blanket?

Possible Answers:

$6\ \text{ft}^2$

$24\ \text{ft}^2$

$12\ \text{ft}^2$

$8\ \text{ft}^2$

$7\ \text{ft}^2$

Correct answer:

$7\ \text{ft}^2$

Explanation:

If Jen's blanket is half as big as Leslie's blanket, and Leslie's blanket is $14\ \text{ft}^2$ , then we need to divide by 2 to find the area of Jen's blanket.

$14\ \text{ft}^2\div2=7\ \text{ft}^2$

The area of Jen's blanket is $7\ \text{ft}^2$ .

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Example Question #11 : Rectangles

What is the area (in square feet) of a rectangle with a length of feet and a width of feet?

Possible Answers:

$46\ \text{ft}^2$

$42\ \text{ft}^2$

$38\ \text{ft}^2$

$47\ \text{ft}^2$

$49\ \text{ft}^2$

Correct answer:

$42\ \text{ft}^2$

Explanation:

The area of a rectangle is calculated by multiplying length times width.

$A=l\times w$

Given that the width is 6 feet and the height is 7, the product of 6 and 7 is 42.

$A=6\ \text{ft}\times 7\ \text{ft}$

$A=42\ \text{ft}^2$

Therefore, 42 is the correct answer.

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Example Question #42 : Geometry

If the area of a rectangle is 28 square inches and its width is 4 inches, what is the length in inches?

Possible Answers:

None of these

Correct answer:

Explanation:

The area of a rectangle is equal to the width multiplied by the length, or:

$A=l\times w$

If the area of a rectangle is 28 inches and the width is 4 inches, then plugging this into the equation we would get:

$28=l\times4$

28=4l

Divide both sides by 4 to solve.

$28\div4=4l\div4$

7=l

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Example Question #42 : Geometry

If a rectangle has an area of 18, which of the following are possible dimensions of the length and width?

Possible Answers:

$l=4,\ w=3$

$l=9,\ w=2$

$l=5,\ w=3$

None of these

$l=8,\ w=2$

Correct answer:

$l=9,\ w=2$

Explanation:

If the area of the rectangle is 18, that means that the length and the width, when multiplied together, should equal 18.

$A=l\times w=18$

The only numbers from the answer choices that would result in the product of 18 are 9 by 2, which is therefore the correct answer.

$l=9,\ w=2$

$9\times2=18$

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Example Question #13 : How To Find The Area Of A Rectangle

Ben is making a sandbox with a width of 4 feet and a length of 6 feet. What is the area of the sandbox?

Possible Answers:

$22\ \text{ft}^2$

$24\ \text{ft}^2$

$36\ \text{ft}^2$

$42\ \text{ft}^2$

$18\ \text{ft}^2$

Correct answer:

$24\ \text{ft}^2$

Explanation:

The area of a rectangle is the width times the length.

$A=w\times l$

The width is 4 feet and the length is 6 feet. Because 4 times 6 is 24, the area is 24 square feet.

$A=4\text{ft}\times6\text{ft}$

$A=24\ \text{ft}^2$

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Example Question #44 : Geometry

Jerry has a mat with an area of 20 square feet and a length of 5 feet. What is the width of the mat in inches?

Possible Answers:

None of these

$20\text{in}$

$48\text{in}$

$4\text{in}$

$24\text{in}$

Correct answer:

$48\text{in}$

Explanation:

The area of a rectangle is the width times the length.

$A=w\times l$

Given that the area is 20 square feet and the length is 5 feet, the width would have to be 4 feet because 5 times 4 is 20.

$20\text{ft}^2=w\times5\text{ft}$

$w=\frac{20\text{ft}^2}{5\text{ft}}=4\text{ft}$

Given that the question asks for the width in inches, 4 should be multiplied by 12 (as there are 12 inches in a foot).

$4\text{ft}\times12\text{inches per foot}=48\text{in}$

This gives us a product of 48 inches, which is the width.

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Example Question #11 : How To Find The Area Of A Rectangle

If the length of a rectangle is 2r and the width of the rectangle is 3w, what is the area?

Possible Answers:

$3(rw)^{2}$

6rw

Correct answer:

6rw

Explanation:

The area of a rectangle is found by multiplying the length by the width. Given that the length is 2r and that the length is 3w, the area will be the product of those numbers, which is 6rw .

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Example Question #982 : Isee Lower Level (Grades 5 6) Mathematics Achievement

A rectangle has a length of 10 feet and a width of 1 foot. What is the area of the rectangle?

Possible Answers:

$20\ \text{ft}^2$

$5\ \text{ft}^2$

$11\ \text{ft}^2$

$22\ \text{ft}^2$

$10\ \text{ft}^2$

Correct answer:

$10\ \text{ft}^2$

Explanation:

The area of a rectangle is calculated by multiplying the length by the width.

$A=l\times w$

Given that the length is 10 feet and that the width is 1 foot we can multiply to find the final area:

$A=10\text{ft}\times1\text{ft}=10\text{ft}^2$

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Example Question #983 : Isee Lower Level (Grades 5 6) Mathematics Achievement

What is the area of a rectangle with a width of 6 inches and a length of 7 inches?

Possible Answers:

$24\ \text{in}^2$

$13\ \text{in}^2$

$26\ \text{in}^2$

$84\ \text{in}^2$

$42\ \text{in}^2$

Correct answer:

$42\ \text{in}^2$

Explanation:

The area of a rectangle is equal to the length multiplied by the width. Since the width is 6 inches and the length is 7 inches, the area is equal to 6 times 7.

$A=l\times w$

$A=7\text{in}\times6\text{in}=42\text{in}^2$

The area is 42 square inches.

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ISEE Lower Level Math : How to find the area of a rectangle

Study concepts, example questions & explanations for ISEE Lower Level Math

All ISEE Lower Level Math Resources

Example Questions

Example Question #11 : How To Find The Area Of A Rectangle

Example Question #12 : How To Find The Area Of A Rectangle

Example Question #11 : Rectangles

Example Question #42 : Geometry

Example Question #42 : Geometry

Example Question #13 : How To Find The Area Of A Rectangle

Example Question #44 : Geometry

Example Question #11 : How To Find The Area Of A Rectangle

Example Question #982 : Isee Lower Level (Grades 5 6) Mathematics Achievement

Example Question #983 : Isee Lower Level (Grades 5 6) Mathematics Achievement

All ISEE Lower Level Math Resources

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