ISEE Middle Level Math : ISEE Middle Level (grades 7-8) Mathematics Achievement

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

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Example Questions

Example Question #93 : Algebraic Concepts

Reduce the expression: 

\(\displaystyle \frac{4x^{3}y^{2}}{2x}\)

Possible Answers:

\(\displaystyle 2y^{2}\)

\(\displaystyle 2x^{2}y^{2}\)

\(\displaystyle 0\)

Cannot be reduced

\(\displaystyle y^{5}\)

Correct answer:

\(\displaystyle 2x^{2}y^{2}\)

Explanation:

For this division problem, you must deal with the like terms.  

You will divide the constants and then divide the \(\displaystyle x\) variables.  

\(\displaystyle 4\div2=2\) 

and then 

\(\displaystyle x^{3}\div x=x^{2}\) 

because when dividing exponents with common bases, you just subtract the exponents.  

The \(\displaystyle y\) variable remains unchanged and your answer is,

\(\displaystyle 2x^{2}y^{2}\).

Example Question #94 : Algebraic Concepts

\(\displaystyle 7^{4} \div (18-11) =\)

Possible Answers:

\(\displaystyle 49\)

\(\displaystyle 17\)

\(\displaystyle 343\)

\(\displaystyle 1\)

Correct answer:

\(\displaystyle 343\)

Explanation:

To solve  

\(\displaystyle 7^{4} \div (18-11) =\)

First, use the order of operations.

\(\displaystyle 7^{4} \div 7 =\)

When dividing with variables and the coefficients are the same, subtract the exponents.

\(\displaystyle 7^{4} \div 7^{1} = 7^{4-1}\)

\(\displaystyle 7^{4-1} = 7^{3}\)\(\displaystyle 7^{3} = 7\times 7\times 7 = 343\)

 

Example Question #21 : How To Divide Variables

\(\displaystyle \frac{x^{8}}{x^{2}}\)

Possible Answers:

\(\displaystyle x^{4}\)

\(\displaystyle x^{6}\)

\(\displaystyle x^{\frac{1}{4}}\)

\(\displaystyle x^{10}\)

Correct answer:

\(\displaystyle x^{6}\)

Explanation:

To solve, subtract the exponents

 \(\displaystyle \frac{x^{8}}{x^{2}} = x^{8-2}\)

\(\displaystyle x^{6}\)

Example Question #22 : How To Divide Variables

\(\displaystyle \frac{n^{3}}{n^{6}}\)

Possible Answers:

\(\displaystyle n^{\frac{1}{2}}\)

\(\displaystyle \frac{1}{n^{3}}\)

\(\displaystyle n^{9}\)

\(\displaystyle n^{3}\)

Correct answer:

\(\displaystyle \frac{1}{n^{3}}\)

Explanation:

To solve \(\displaystyle \frac{n^{3}}{n^{6}}\) subtract the exponents

\(\displaystyle n^{3-6} = n^{-3}\)

\(\displaystyle n^{-3} = n\div -3 =\)

\(\displaystyle \frac{1}{n^{3}}\)

Example Question #97 : Algebraic Concepts

The area (A) of a rectangle is \(\displaystyle 36ab^{3}\) square units.  The length is \(\displaystyle 6ab\) units. What is the width of this rectangle?

Possible Answers:

\(\displaystyle 6b^{2\) units

\(\displaystyle 216ab^{2}\) units

\(\displaystyle 6a^{2}b^{2}\) units

\(\displaystyle 216a^{2}b^{4}\) units

Correct answer:

\(\displaystyle 6b^{2\) units

Explanation:

The formula for the Area of a rectangle is:

A - length x width

Is this problem, you are given the amount of total area or A, which is\(\displaystyle 36ab^{3}\) square units, and you are given the measurement of the length, which is \(\displaystyle 6ab\).  In order to solve for the measurement of the width, divide.  When dividing, exponents are subtracted.

 

\(\displaystyle 36\div6 =6\)

\(\displaystyle \frac{a^{1}}{a^{1}} = a^{1-1} = a^{0} = 1\)

\(\displaystyle \frac{b^{3}}{b^{1}} = b^{3-1} = b^{2}\)

\(\displaystyle 6 (1) \times b^{2} = 6b^{2}\) units 

Example Question #96 : Algebraic Concepts

\(\displaystyle \frac{9x^{4}y^{6}}{3x^{2}y^{2}} =\)

Possible Answers:

\(\displaystyle 6x^{2}y^{4}\)\(\displaystyle 3x^{2}y^{3}\)

\(\displaystyle 6x^{8}y^{12}\)

\(\displaystyle 3x^{2}y^{4}\)

Correct answer:

\(\displaystyle 3x^{2}y^{4}\)

Explanation:

To solve \(\displaystyle \frac{9x^{4}y^{6}}{3x^{2}y^{2}}\) separate each part of the terms and divide.  When dividing variables with exponents, subtract the exponents.

\(\displaystyle 9\div 3 = 3\)

\(\displaystyle \frac{x^{4}}{x^{2}}=x^{4-2} =x^{2}\)

\(\displaystyle \frac{y^{6}}{y^{2}}=y^{6-2} =y^{4}\)

\(\displaystyle 3x^{2}y^{4}\)

 

Example Question #101 : Algebraic Concepts

\(\displaystyle \frac{9x^{5}y^{4}}{3x^{3}y^{9}}\)

Possible Answers:

\(\displaystyle \frac{y^{5}}{3x^{2}}\)

\(\displaystyle 3x^{8}y^{13}\)

\(\displaystyle \frac{3x^{2}}{y^5}\)

\(\displaystyle 3x^{2}y^{5}\)

Correct answer:

\(\displaystyle \frac{3x^{2}}{y^5}\)

Explanation:

Separate each part of the division problem. When dividing, exponents are subtracted.

\(\displaystyle 9 \div3 =3\)

\(\displaystyle \frac{x^{5}}{x^{3}} = x^{5-3} = x^{2}\)

\(\displaystyle \frac{y^{4}}{y^{9}} = y^{4-9} = y^{-5}\)

\(\displaystyle 3x^{2}y^{-5} =\)

\(\displaystyle \frac{3x^{2}}{y^{5}}\)

Example Question #23 : How To Divide Variables

Simplify the following statement.

\(\displaystyle \frac{14x^6}{7x^3}\)

Possible Answers:

\(\displaystyle 7x^3\)

\(\displaystyle 3x^2\)

\(\displaystyle 2x^2\)

\(\displaystyle 2x^3\)

Correct answer:

\(\displaystyle 2x^3\)

Explanation:

Simplify the following statement.

\(\displaystyle \frac{14x^6}{7x^3}\)

TO divide variables, we need to subtract the exponents. The coefficients (numbers out in front) can be divided as you would normally divide.

\(\displaystyle \frac{14x^6}{7x^3}=\frac{14}{7}*x^{6-3}=2x^3\)

So we get our answer of two x cubed.

Example Question #2 : Expressions & Equations

Simplify:

\(\displaystyle 14x - 5 (x + 8)\)

Possible Answers:

\(\displaystyle 9x - 8\)

\(\displaystyle 9x -40\)

\(\displaystyle x\)

\(\displaystyle 9x+ 40\)

\(\displaystyle 9x + 8\)

Correct answer:

\(\displaystyle 9x -40\)

Explanation:

\(\displaystyle 14x - 5 (x + 8)\)

\(\displaystyle = 14x - 5 \cdot x - 5 \cdot 8\)

\(\displaystyle = 14x - 5x - 40\)

\(\displaystyle = (14- 5) x - 40\)

\(\displaystyle = 9x - 40\)

Example Question #3 : Apply Properties Of Operations To Expand Linear Expressions With Rational Coefficients: Ccss.Math.Content.7.Ee.A.1

Simplify:

\(\displaystyle 8 (x - 7) - 3(x + 2)\)

Possible Answers:

\(\displaystyle 11x - 62\)

\(\displaystyle 5x-9\)

\(\displaystyle 5 x - 50\)

\(\displaystyle 5 x - 62\)

\(\displaystyle 11x-9\)

Correct answer:

\(\displaystyle 5 x - 62\)

Explanation:

\(\displaystyle 8 (x - 7) - 3(x + 2)\)

\(\displaystyle = 8 \cdot x -8 \cdot 7 - 3 \cdot x + (-3) \cdot 2\)

\(\displaystyle = 8x -56 - 3 x -6\)

\(\displaystyle = 8x - 3 x -56 -6\)

\(\displaystyle =( 8 - 3 ) x - (56 + 6)\)

\(\displaystyle =5 x - 62\)

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