ISEE Middle Level Quantitative : ISEE Middle Level (grades 7-8) Quantitative Reasoning

Study concepts, example questions & explanations for ISEE Middle Level Quantitative

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Example Questions

Example Question #8 : Triangles

 is a right triangle with hypotenuse  10 inches long.

The lengths of  and  , in inches, can both be expressed as integers.

Which is the greater quantity?

(a) 

(b) The perimeter of 

Possible Answers:

It is impossible to tell from the information given

(b) is greater

(a) and (b) are equal

(a) is greater

Correct answer:

(a) and (b) are equal

Explanation:

By the Pythagorean Theorem, 

By trial and error, it can be determined that the only two positive integers that can replace  and  to make this equation true are 6 and 8, in either order:

Add the three side lengths to get the perimeter  inches, which is equal to 2 feet.

Example Question #5 : Triangles

An equilateral triangle has perimeter two yards. Which is the greater quantity?

(A) The length of one side of the triangle

(B) 28 inches

Possible Answers:

(A) and (B) are equal

It is impossible to determine which is greater from the information given

(A) is greater

(B) is greater

Correct answer:

(B) is greater

Explanation:

An equilateral triangle has three sides of equal length; the perimeter of this triangle is two yards, which is equal to  inches. One side has length  inches, which is less than 28 inches, so (B) is greater.

Example Question #10 : Triangles

Right_triangle

Note: Figure NOT drawn to scale.

Refer to the above triangle. An insect walks directly from B to A, then directly from A to C. What percent of the perimeter of the triangle has he walked?

Possible Answers:

It is impossible to answer the question from the information given.

Correct answer:

Explanation:

By the Pythagorean Theorem, the distance from A to C, which we will call , is equal to 

The perimeter of the triangle is . The insect has traveled  units out of 12, which is 

 of the perimeter.

Example Question #251 : Geometry

Right_triangle

Note: Figure NOT drawn to scale.

Refer to the above triangle. An insect walks directly from A to B, then directly from B to C. What fraction of the perimeter of the triangle has he walked?

Possible Answers:

Correct answer:

Explanation:

By the Pythagorean Theorem, the distance from A to C, which we will call , is equal to 

The perimeter of the triangle is . The insect has traveled  units, or  of the perimeter.

Example Question #251 : Geometry

Right_triangle

Note: Figure NOT drawn to scale

Refer to the above triangle. An insect walks directly from B to C, then directly from C to A. What fraction of the perimeter of the triangle has he walked?

Possible Answers:

Correct answer:

Explanation:

By the Pythagorean Theorem, the distance from B to C, which we will call , is equal to 

The perimeter of the triangle is 

.

The insect has traveled  units, which is 

of the perimeter.

Example Question #253 : Geometry

Right_triangle

Note: Figure NOT drawn to scale

Refer to the above triangle. An insect walks directly from A to B, then directly from B to C. What percent of the perimeter of the triangle has he walked?

Possible Answers:

Correct answer:

Explanation:

By the Pythagorean Theorem, the distance from B to C, which we will call , is

.

The perimeter of the triangle is 

.

The insect has traveled  units, or 

 of the perimeter.

Example Question #252 : Geometry

A triangle has base 80 inches and area 4,200 square inches. What is its height?

Possible Answers:

Correct answer:

Explanation:

Use the area formula for a triangle, setting :

 inches

Example Question #2 : How To Find The Area Of A Triangle

The sum of the lengths of the legs of an isosceles right triangle is one meter. What is its area in square centimeters?

Possible Answers:

It is impossible to determine the area from the information given

Correct answer:

Explanation:

The legs of an isosceles right triangle have equal length, so, if the sum of their lengths is one meter, which is equal to 100 centimeters, each leg measures half of this, or 

 centimeters.

The area of a triangle is half the product of its height and base; for a right triangle, the legs serve as height and base, so the area of the triangle is

 square centimeters.

Example Question #11 : Triangles

Pentagon

The above figure depicts Square , and  are the midpoints of , and , respectively.

 has area . What is the area of Square  ?

Possible Answers:

Correct answer:

Explanation:

Since , and  are the midpoints of , and , if we call  the length of each side of the square, then 

The area of  is half the product of the lengths of its legs:

The area of the square is the square of the length of a side, which is . This is eight times the area of , so the correct choice is 

Example Question #11 : Triangles

Right triangle 3

Which of the following is the greater quantity?

(a) The area of the above triangle

(b) 800

Possible Answers:

(b) is the greater quantity

(a) is the greater quantity

It is impossible to determine which is greater from the information given

(a) and (b) are equal

Correct answer:

(b) is the greater quantity

Explanation:

The area of a right triangle is half the product of the lengths of its legs, which here are 25 and 60. So

which is less than 800.

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