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SSAT Upper Level Math : Number Concepts and Operations

Study concepts, example questions & explanations for SSAT Upper Level Math

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All SSAT Upper Level Math Resources

6 Diagnostic Tests 311 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #8 : How To Find The Next Term In An Arithmetic Sequence

Find the next term of the arithmetic sequence:

-15, 11, 37, ?

Possible Answers:

Correct answer:

Explanation:

The common difference is . Add this to the last given term to find the next term.

37+26=63

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Example Question #9 : How To Find The Next Term In An Arithmetic Sequence

Find the next term of the arithmetic sequence:

10, 130, 250, ?

Possible Answers:

300

370

350

470

Correct answer:

370

Explanation:

The common difference is 120 . Add this to the last given term to find the next term.

250+120=370

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Example Question #10 : How To Find The Next Term In An Arithmetic Sequence

Find the next term in the following arithmetic sequence:

$\frac{9}{2}, 4, \frac{7}{2}, ?$

Possible Answers:

$\frac{3}{2}$

$\frac{5}{2}$

Correct answer:

Explanation:

The common difference for this arithmetic sequence is $-\frac{1}{2}$ . To find the next term in the sequence, subtract that value from the last given value.

$\frac{7}{2}-\frac{1}{2}=3$

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Example Question #551 : Number Concepts And Operations

Find the next term in the following arithmetic sequence:

13, 10, 7, ?

Possible Answers:

Correct answer:

Explanation:

The sequence is subtracting for each term. The next term can be found by subtracting from :

7-3=4

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Example Question #552 : Number Concepts And Operations

Find the next number in this arithmetic sequence:

-10, -20, -30, ?

Possible Answers:

Correct answer:

Explanation:

The common difference for this arithmetic sequence is . Take away from to get the next term.

-30-10=-40

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Example Question #553 : Number Concepts And Operations

Find the next term in this arithmetic sequence:

16, 13, 10, ?

Possible Answers:

Correct answer:

Explanation:

The common difference for this sequence is . Subtract from the last given term to find the next term.

10-3=7

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Example Question #1 : How To Find The Frequency Of An Event

In a small school, ninth grade comprises 54 students, including 22 boys. Each student is assigned to one of two home rooms - those of Mr. Brooks and Mrs. Kelly. The boys and the girls are both divided evenly between the home rooms.

According to the charter, two of the student council representatives from the ninth grade will be selected by choosing one at random from each home room. What is the probability that both representatives selected will be girls?

Possible Answers:

$\frac{8}{27}$

$\frac{256}{729}$

$\frac{176}{729}$

$\frac{121}{729}$

$\frac{16}{27}$

Correct answer:

$\frac{256}{729}$

Explanation:

22 out of the 54 students are boys, so 32 are girls. Also, since the boys and the girls are split evenly between the home rooms, each home room has 11 boys and 16 girls for a total of 27 students.

This means that the probability of a randomly selected student from Mr. Brooks's home room being a girl is $\frac{16}{27}$ ; the probability is the same for Mrs. Kelly's homeroom. By the multiplication principle, the probability of both students being girls is $\frac{16}{27} \times \frac{16}{27} = \frac{256}{729}$ .

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Example Question #554 : Number Concepts And Operations

Three fair six-sided dice are rolled, and the numbers are multiplied. What are the odds against rolling an odd product?

Possible Answers:

8 to 1

2 to 1

7 to 1

4 to 1

Even

Correct answer:

7 to 1

Explanation:

Three whole numbers have an odd product if and only if all three factors are odd. Therefore, for three dice to show an odd product, all three dice must show odd numbers.

The probability of a die showing an odd number is $\frac{3}{6} = \frac{1}{2}$ , so the probability of all three dice showing odd numbers - equivalently, the probability of an odd product - is $\frac{1}{2} \times \frac{1}{2} \times \frac{1}{2} = \frac{1}{8}$ . This translates to

$\frac{8-1}{1} = \frac{7}{1}$ or 7 to 1 odds against an odd product.

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Example Question #555 : Number Concepts And Operations

Three fair six-sided dice are rolled, and the numbers are added. What is the probability that the sum will be 16 or greater?

Possible Answers:

$\frac{11}{216}$

$\frac{9}{216}$

$\frac{5}{108}$

$\frac{1}{27}$

$\frac{1}{18}$

Correct answer:

$\frac{5}{108}$

Explanation:

There are $6^{3}= 216$ outcomes for the roll of three six-sided dice. Of these outcomes, the following are the ways to roll a 16 or greater:

18: (6,6,6)

17:(5,6,6), (6,5,6),(6,6,5)

16:(5,5,6), (5,6,5),(6,5,5),(4,6,6),(6,4,6),(6,6,4)

This is 10 rolls with the desired outcome out of a possible 216, which translates to a probability of $\frac{10}{216} = \frac{5}{108}$

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Example Question #1653 : Ssat Upper Level Quantitative (Math)

The aces, jacks, kings, and queens are removed from a red-backed deck of standard playing cards; the same is done with a blue-backed deck. One card is removed at random from each deck; the numbers are multiplied together. What are the odds of the product being odd?

Possible Answers:

3 to 1 against

5 to 4 against

7 to 2 against

The correct answer is not given among the other responses.

Even

Correct answer:

The correct answer is not given among the other responses.

Explanation:

Two whole numbers have an odd product if and only if both factors are odd.

After the aces and face cards are removed from each deck, there are nine ranks left - the twos through tens - each of which are represented by four cards and each of which are therefore equally probable in each deck. The probability of drawing an odd card from the red deck is $\frac{4}{9}$ , and the same holds for the blue deck. The probability of drawing two odd cards - equivalently, the probability of an odd product - is $\frac{4}{9} \times \frac{4}{9} = \frac{16}{81}$ ; this translates to

$\frac{81-16}{16} = \frac{65}{16}$ or 65 to 16 odds against this occurrence. This answer is not among the responses.

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All SSAT Upper Level Math Resources

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SSAT Upper Level Math : Number Concepts and Operations

Study concepts, example questions & explanations for SSAT Upper Level Math

All SSAT Upper Level Math Resources

Example Questions

Example Question #8 : How To Find The Next Term In An Arithmetic Sequence

Example Question #9 : How To Find The Next Term In An Arithmetic Sequence

Example Question #10 : How To Find The Next Term In An Arithmetic Sequence

Example Question #551 : Number Concepts And Operations

Example Question #552 : Number Concepts And Operations

Example Question #553 : Number Concepts And Operations

Example Question #1 : How To Find The Frequency Of An Event

Example Question #554 : Number Concepts And Operations

Example Question #555 : Number Concepts And Operations

Example Question #1653 : Ssat Upper Level Quantitative (Math)

All SSAT Upper Level Math Resources

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