ISEE Middle Level Quantitative : How to subtract variables

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

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Example Questions

Example Question #14 : Operations

What is the value of ?

Possible Answers:

Correct answer:

Explanation:

To solve for , the fractions should first be converted to ones that share a common denominator. Given that , the common denominator is 12. 

Thus,  can be converted to . This gives us:

Example Question #14 : Operations

Simplify:

Possible Answers:

Correct answer:

Explanation:

It is easiest to begin by moving like terms together. Hence:

becomes

(Notice that  is its own term.)

Now, consider the coefficients for each term.

For , you have 

For , you have 

Hence, the expression simplifies to:

This can be moved around to get the correct answer (which means the same thing):

Example Question #15 : Operations

Simplify:

Possible Answers:

Correct answer:

Explanation:

Begin by distributing the two groups. Notice that you must distribute the subtraction through the groups:

becomes

Next, you should move like terms next to each other:

(Notice that  is its own term.)

Now, combine terms.

For , you get 

For , you get 

Therefore, the final form of the expression is:

Example Question #16 : Operations

Solve for :

Possible Answers:

Correct answer:

Explanation:

Begin by distributing. Thus,

becomes

(Don't forget that you have to distribute your subtraction for the second group.)

Combine like terms on the right side of the equation:

Next, move the  values to the left side of the equation and all of the other values to the right side:

Combine like terms on the left:

Finally, divide everything by :

This comes out to be:

or

Example Question #17 : Operations

Simplify:

Possible Answers:

Correct answer:

Explanation:

Begin by distributing the multiplied groups:

Next, move all similar factors together:

Now, combine each set of similar factors:

Therefore, our answer is:

Example Question #18 : Operations

Simplify:

Possible Answers:

Correct answer:

Explanation:

This problem is not too difficult. Begin by moving all common terms next to each other:

Next, simplify each group of terms that has the same set of variables:

And do not forget that you are left with  as well!

Now, combine all of these:

Example Question #19 : Operations

Simplify:

Possible Answers:

Correct answer:

Explanation:

Begin by moving common factors next to each other. Thus,

becomes

Now, combine each set:

Remember, there still is  also.

Therefore, the simplified form of the expression is:

 

Example Question #1 : How To Subtract Variables

Which is the greater quantity?

(a) 

(b) 9

Possible Answers:

(a) is the greater quantity

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

(a) and (b) are equal

(b) is the greater quantity

Correct answer:

(b) is the greater quantity

Explanation:

also, since , it follows that 

 

, and by the inequality properties, 

making 9 the greater quantity.

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