ISEE Middle Level Quantitative : How to divide variables

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

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Example Questions

Example Question #1 : How To Divide Variables

What is the value of ?

Possible Answers:

Correct answer:

Explanation:

(The numerator and the denominator are both multiplied by 10 in order to convert the fraction to whole numbers.)

Therefore, 90 is the correct answer. 

Example Question #2 : How To Divide Variables

What is the value of ?

Possible Answers:

Correct answer:

Explanation:

(The numerator and the denominator are both multiplied by 10 in order to convert the fraction to whole numbers.)

Therefore, 30 is the correct answer. 

Example Question #1 : How To Divide Variables

Simplify:

Possible Answers:

Correct answer:

Explanation:

Since all of the variables are positive powers, this is easy. Start by reducing the numeric coefficient:

Next, cancel out the variables. Subtract the smaller power from the larger one. Remember that if there is no power listed, it is 1:

Example Question #4 : How To Divide Variables

Simplify:

 

Possible Answers:

Correct answer:

Explanation:

Since all of the variables are positive powers, this is easy. Start by reducing the numeric coefficient:

 

Next, cancel out the variables. Subtract the smaller power from the larger one. Remember that if there is no power listed, it is 1:

Example Question #2 : How To Divide Variables

Simplify:

Possible Answers:

Correct answer:

Explanation:

The easiest way to begin with questions like this one is to "flip" the negative exponents to the top or bottom of the fraction. When you do this, you make the exponent's sign positive:

Now, since all of the variables are positive powers, this is easy. Normally, you would begin by reducing the numeric coefficient. This is not necessary since there is only a 5 in the numerator. Therefore, combine the like variables first:

Next, cancel out the variables. Subtract the smaller power from the larger one. Remember that if there is no power listed, it is 1:

Example Question #3 : How To Divide Variables

Simplify:

Possible Answers:

Correct answer:

Explanation:

The easiest way to begin with questions like this one is to "flip" the negative exponents to the top or bottom of the fraction.  When you do this, you make the exponent's sign positive:

Next, go ahead and reduce the numeric coefficient:

Then, combine the like variables first:

Finally, cancel out the variables. Subtract the smaller power from the larger one. Remember that if there is no power listed, it is 1:

Example Question #7 : How To Divide Variables

Solve for :

Possible Answers:

Correct answer:

Explanation:

To start, notice that the left side of the equation has a common factor of . You can factor this out:

becomes

Next, you can divide both sides by  since you know that it does not equal :

Simplifying the right side, you get:

Finally, subtract  from both sides:

Example Question #8 : How To Divide Variables

Solve for :

Possible Answers:

No possible answer

Correct answer:

Explanation:

To start, notice that the left side of the equation has common factors of  and . You can factor these out:

becomes...

Next, you can divide both sides by  since you know that it does not equal :

Simplify the right side by canceling the  and reducing the :

Finally, add  to both sides:

Example Question #9 : How To Divide Variables

 is the multiplicative inverse of . Which is the greater quantity?

(a) 

(b) 

Possible Answers:

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

(a) is the greater quantity

(b) is the greater quantity

(a) and (b) are equal

Correct answer:

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

Explanation:

 is the multiplicative inverse of , so, by definition, . We show that this is insufficient information, however, with two cases.

Case 1: 

Case 2: 

Therefore,it is not clear which, if either, is the greater,  or 1.

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