### All PSAT Math Resources

## Example Questions

### Example Question #1 : How To Find The Least Common Multiple

How many positive integers less than ten thousand are multiples of both eight and eighteen?

**Possible Answers:**

70

139

138

72

555

**Correct answer:**

138

In order to find all of the numbers that are multiples of both 8 and 18, we need to find the least common mutliple (LCM) of 8 and 18. The easiest way to do this would be to list out the multiples of 8 and 18 and determine the smallest one that is common to both.

First, let's list the first several multiples of eight:

8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88 . . .

Next, we list the first several multiples of eighteen:

18, 36, 54, 72, 90, 108, 126, 144 . . .

By comparing the multiples of eight and eighteen, we can see that the smallest one that they share is 72. Thus, the LCM of 8 and 18 is 72.

Because the LCM is 72, this means that every multiple of 72 is also a multiple of both 8 and 18. So, in order to find all of the multiples less than ten thousand that are both multiples of 8 and 18, we simply need to find how many multiples of 72 are less than 10000, and to do this, all we have to do is to divide 10000 by 72.

When we divide 10000 by 72, we get 138 with a remainder of 64; therefore, 72 will go into ten thousand 138 times before it exceeds ten thousand. In other words, there are 138 numbers less than 10000 that are multiples of 72 and, by extension, also multiples of both 8 and 18.

The answer is 138.

### Example Question #1 : Factors / Multiples

If is divisible by 2, 4 and 7, which of the following is a possible value of ?

**Possible Answers:**

154

168

136

114

172

**Correct answer:**

168

The simplest way to solve this question is to go through each answer choice and check to see if it is divisible by 2, 4 and 7. When we do this, we find that only 168 is evenly divisible by each of these numbers. 114 is not divisible by 4 or 7, 172 is not divisibly by 7, 136 is not divisble by 7, and 154 is not divisible by 4.

### Example Question #2 : Factors / Multiples

If *a*, *b*, and *c* are positive integers such that 4*a* = 6*b* = 11*c*, then what is the smallest possible value of *a *+ *b *+ *c*?

**Possible Answers:**

67

132

11

33

121

**Correct answer:**

67

We are told that *a*, *b*, and *c* are integers, and that 4*a* = 6*b* = 11*c*. Because *a*, *b*, and *c* are positive integers, this means that 4*a* represents all of the multiples of 4, 6*b* represents the multiples of 6, and 11*c* represents the multiples of 11. Essentially, we will need to find the least common multiples (LCM) of 4, 6, and 11, so that 4*a*, 6*b*, and 11*c* are all equal to one another.

First, let's find the LCM of 4 and 6. We can list the multiples of each, and determine the smallest multiple they have in common. The multiples of 4 and 6 are as follows:

4: 4, 8, 12, 16, 20, ...

6: 6, 12, 18, 24, 30, ...

The smallest multiple that 4 and 6 have in common is 12. Thus, the LCM of 4 and 6 is 12.

We must now find the LCM of 12 and 11, because we know that any multiple of 12 will also be a multiple of 4 and 6.

Let's list the first several multiples of 12 and 11:

12: 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, ...

11: 11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 121, 132, ...

The LCM of 12 and 11 is 132.

Thus, the LCM of 4, 6, and 12 is 132.

Now, we need to find the values of *a*, *b*, and *c*, such that 4*a* = 6*b* = 12*c* = 132.

4*a* = 132

Divide each side by 4.

*a* = 33

Next, let 6*b* = 132.

6*b* = 132

Divide both sides by 6.

*b* = 22

Finally, let 11*c* = 132.

11*c* = 132

Divide both sides by 11.

*c* = 12.

Thus, *a* = 33, *b* = 22, and *c* = 12.

We are asked to find the value of *a* + *b* + *c*.

33 + 22 + 12 = 67.

The answer is 67.

### Example Question #1 : How To Find The Greatest Common Factor

If is divisible by 2, 3 and 15, which of the following is also divisible by these numbers?

**Possible Answers:**

**Correct answer:**

Since *v* is divisible by 2, 3 and 15, *v* must be a multiple of 30. Any number that is divisible by both 2 and 15 must be divisible by their product, 30, since this is the least common multiple.

Out of all the answer choices, *v* + 30 is the only one that equals a multiple of 30.

### Example Question #2 : How To Find The Greatest Common Factor

Suppose that is an integer such that is ten greater than . What is the value of ?

**Possible Answers:**

**Correct answer:**

We are given information that m/4 is 10 greater than m/3. We set up an equation where m/4 = m/3 + 10.

We must then give the m variables a common denominator in order to solve for m. Since 3 * 4 = 12, we can use 12 as our denominator for both m variables.

m/4 = m/3 + 10 (Multiply m/4 by 3 in the numerator and denominator.)

3m/12 = m/3 + 10 (Multiply m/3 by 4 in the numerator and denominator.)

3m/12 = 4m/12 + 10 (Subtract 4m/12 on both sides.)

-m/12 = 10 (Multiply both sides by -12.)

**m = -120**

-120/4 = -30 and -120/3 = -40. -30 is 10 greater than -40.

### Example Question #3 : Factors / Multiples

; , , and are *distinct* integers.

Which of the following is a *possible* value of ?

**Possible Answers:**

**Correct answer:**

We need to find ways to factor 18 such that the three factors are different, and then find the sum of those factors in each case.

18 can be factored as the product of three integers in four ways:

I)

II)

III)

IV)

Disregard I and IV since each repeats a factor.

In (II), the sum of the factors is ; in (III) the sum is . Of the five choices, only 12 is possible.

### Example Question #4 : Factors / Multiples

.

, , and are integers; they may or may not be distinct.

Which of the following cannot be equal to ?

**Possible Answers:**

**Correct answer:**

We look for ways to write 45 as the product of three integers, then we find the sum of the integers in each situation. They are:

Sum:

Sum:

Sum:

Sum:

Of the five choices, only 33 is not a possible sum of the factors. This is the correct choice.

### Example Question #5 : Factors / Multiples

What is the greatest common factor of and ?

**Possible Answers:**

**Correct answer:**

The greatest common factor is the largest factor that both numbers share. Each number has many factors. The factors for 72 are as follows:

Starting from the largest factor, 72, we can see that it is also a factor of 144

.

Therefore, 72 is the greatest common factor.

### Example Question #3 : How To Find The Greatest Common Factor

, , and are positive two-digit integers.

The greatest common divisor of and is 10.

The greatest common divisor of and is 9.

The greatest common divisor of and is 8.

If is an integer, which of the following could it be equal to?

**Possible Answers:**

**Correct answer:**

The greatest common divisor of and is 10. This means that the prime factorizations of and must both contain a 2 and a 5.

The greatest common divisor of and is 9. This means that the prime factorizations of and must both contain two 3's.

The greatest common divisor of and is 8. This means that the prime factorizations of and must both contain three 2's.

Thus:

We substitute these equalities into the given expression and simplify.

Since and are two-digit integers (equal to and respectively), we must have and . Any other factor values for or will produce three-digit integers (or greater).

is equal to , so could be either 1 or 2.

Therefore:

or

### Example Question #1 : How To Find Out If A Number Is Prime

The sum of the first seven prime numbers divided by two is

**Possible Answers:**

29

58

24

33

61

**Correct answer:**

29

The first seven primes are 2, 3, 5, 7, 11, 13, and 17. Don't forget about 2, the smallest prime number, and also the only even prime! Adding these seven numbers gives a sum of 58, and 58/2 = 29.

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