### All GRE Math Resources

## Example Questions

### Example Question #1 : How To Multiply Fractions

There are 340 students at Saint Louis High School in the graduating senior class. Of these students, 9/10 are going to college. Of those going to college, 2/5 are going to Saint Louis University. How many students are going to Saint Louis University?

**Possible Answers:**

The answer cannot be determined from the given information.

103

136

122

306

**Correct answer:**

122

122 students are going to Saint Louis University. To answer this question, the following equation can be used: 340*(9/10)*(2/5) . This is then rounded down to 122 students attending Saint Louis University.

### Example Question #2 : How To Multiply Fractions

If of a number is , what is of that number?

**Possible Answers:**

**Correct answer:**

The least common multiple of 4 and 6 is 12.

So we know if of the number is then

of the number is

.

So then it follows that

of the number is

.

### Example Question #3 : How To Multiply Fractions

If and , what is the value of ?

**Possible Answers:**

**Correct answer:**

### Example Question #4 : How To Multiply Fractions

At a certain company, one quarter of the employees take the bus to work and one third drive. Of the remaining employees, half walk, one third ride a bike, and the rest take the subway.

Out of the total number of employees, what fraction ride a bike to work?

**Possible Answers:**

**Correct answer:**

First we want to find the fraction of employees that neither take the bus nor drive, so we’ll add the fractions that do take the bus or drive and subtract that result from the total.

Bus:

Drive:

Remaining:

Now we need the fraction representing one third of these remaining employees (the fraction that ride a bike). Since "of " means multiply, we'll multiply.

### Example Question #11 : Operations

Simplify:

**Possible Answers:**

**Correct answer:**

Multiplying fractions is very easy. All you do is multiply all the numerators by each other and all the denominators by each other. You do not have to do anything that has to do with fancy common denominators like you do for adding and subtracting. For a question like this, it is often easiest just to cancel factors before you start your final multiplication. First, note:

Now, cancel the from the :

Next, the in the numerator cancels with the in the denominator:

Finally, the in the numerator cancels with the in the denominator:

### Example Question #12 : Operations

Simplify:

**Possible Answers:**

**Correct answer:**

Multiplying fractions is very easy. All you do is multiply all the numerators by each other and all the denominators by each other. You do not have to do anything that has to do with fancy common denominators like you do for adding and subtracting. For a question like this, it is often easiest just to cancel factors before you start your final multiplication. First, note:

Now, cancel the in the denominator with the in the numerator:

Next, the in the numerator cancels with the in the denominator:

Finally, cancel the in the denominator with the in the numerator:

### Example Question #13 : Operations

Solve for :

**Possible Answers:**

**Correct answer:**

Begin by distributing the group on the left side of the equation. Remember that it is easy to multiply fractions. You only need to multiply the denominators and numerators. There are no "fancy" steps in between.

Therefore,

is the same as:

You can cancel part of the second fraction out, so you get:

Now, subtract from both sides:

Simplifying the right side of the equation, you get...

Now, multiply both sides by :

Simplify:

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