ISEE Middle Level Math : How to add variables

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

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Example Questions

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Example Question #1 : How To Add Variables

Possible Answers:

Correct answer:

Explanation:

Add the numbers and keep the variable:

Answer:

Example Question #4 : Algebra

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Correct answer:

Explanation:

Add the numbers and keep the variable:

Answer:

Example Question #5 : Algebra

Simplify

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Already simplified

Correct answer:

Explanation:

In order to add variables the terms must be like. In order for terms to be like, the variables must be exactly alike also being raised to the same power by the exponent.

In this case the like terms are  and . Just because there is a 1 in the exponent for the first term doesnt mean it is different from the second term. With exponents if a variable does not show an exponent, that means it is still to the first power. 

We add the coefficients of the like terms. The coefficient is the number in front of the first variable, in this case it is 1 for both terms because of the identity property of multiplication stating any variable, term, or number multiplied by 1 is itself.

    

Our last term is not like because the  variable is raised to a different power than the other two. In this case we do not combine it to the like terms, we just add it to the end of the term. 

Example Question #6 : Algebra

Possible Answers:

Correct answer:

Explanation:

Remember, for exponent problems, you group together different exponents and different combinations of variables as though each were a different type of variable.  Therefore, you can group your problem as follows:

Now, just combine like terms:

Example Question #2 : How To Add Variables

Simplify:

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Correct answer:

Explanation:

You should begin by distributing  through the whole group that it precedes:

Now, move your like variables next to each other:

Finally, combine the like terms:

Example Question #31 : Operations

Simplify:

 

Possible Answers:

Correct answer:

Explanation:

First, group together your like variables:

The only like variables needing to be combined are the x-variables.  You can do this in steps or all at once:

Example Question #32 : Operations

Simplify:

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Correct answer:

Explanation:

First, move the like terms to be next to each other:

Now, combine the x-variables and the y-variables:

Example Question #33 : Operations

Simplify:

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Correct answer:

Explanation:

Let's begin by moving the like terms toward each other.  Notice the following: zy is the same as yz.  (Recall the commutative property of multiplication.)

Now, all you have to do is combine the x-variables and the yz-terms:

Notice that you do not end up with any exponent changes.  That would only happen if you multiplied those variables.

Example Question #34 : Operations

Simplify:

Possible Answers:

Correct answer:

Explanation:

Remember, when you have exponents like this, you will treat each exponented variable as though it were its own "type."  Likewise, pairs of variables are to be grouped together.  Therefore, group the problem as follows:

Notice that the only thing to be combined are the terms.

Therefore, your answer will be:

 

Example Question #3 : How To Add Variables

Simplify:

Possible Answers:

Correct answer:

Explanation:

Remember, for exponent problems, you group together different exponents and different combinations of variables as though each were a different type of variable.  Therefore, you can group your problem as follows:

Then, all you need to do is to combine the  terms:

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