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SAT Math : Arithmetic

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Example Questions

Example Question #7 : Nth Term Of An Arithmetic Sequence

What is the tenth number in the sequence:

4, 7, 12, 19...

Possible Answers:

102

103

Correct answer:

103

Explanation:

The purpose of this question is to understand the patterns of sequences.

First, an equation for the $N^{th}$ term in the sequence must be determined ( $N^{2}+3$ ).

This is true because

N=1 will create 1^2+3=4 ,

N=2 will create 2^2+3=7 ,

N=3 will create 3^2+3=12 ,

N=4 will create 4^2+3=19 .

Then, the eqution must be applied to find the specified term. For the tenth term, the expression $10^{2}+3$ must be evaluated, yielding 103.

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Example Question #3 : How To Find The Nth Term Of An Arithmetic Sequence

You are given a sequence with the same difference between consecutive terms. We know it starts at and its 3rd term is . Find its 10th term.

Possible Answers:

Correct answer:

Explanation:

From the given information, we know -1+2x=5 , which means each consecutive difference is 3.

-1+9x=-1+9(3)=26

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Example Question #7 : Nth Term Of An Arithmetic Sequence

An arithmetic sequence begins as follows:

12.8, 17.2, 21.6 , ...

Give the sixteenth term of this sequence.

Possible Answers:

None of the other responses give the correct answer.

70.0

83.2

78.8

74.4

Correct answer:

78.8

Explanation:

Subtract the first term $a_{1}$ from the second term $a_{2}$ to get the common difference :

$d = a_{2} - a_{1}$

Setting $a_{1} = 12 .8$ and $a_{2} = 17.2$

d = 17.2 - 12.8 = 4.4

The th term of an arithmetic sequence $a_{n}$ can be found by way of the formula

$a_{n} = a_{1}+ (n-1) d$

Setting n = 16 , $a_{1} = 12 .8$ , and d = 4.4 in the formula:

$a_{16} = 12.8 + (16-1) 4.4$

$= 12.8 + 15 \cdot 4.4$

= 12.8 +66

=78.8

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Example Question #21 : Arithmetic Sequences

An arithmetic sequence begins as follows: 14, 27, 40...

What is the first four-digit integer in the sequence?

Possible Answers:

1,002

1,008

1,000

1,006

1,004

Correct answer:

1,002

Explanation:

Given the first two terms $a_{1}$ and $a_{2}$ , the common difference is equal to the difference:

$d = a_{2} - a_{1}$

Setting $a_{1} = 14$ , $a_{2} =27$ :

d = 27 - 14 = 13

The th term of an arithmetic sequence $a_{n}$ can be found by way of the formula

$a_{n} = a_{1}+ (n-1) d$

Since we are looking for the first four-digit whole number - equivalently, the first number greater than or equal to 1,000:

$a_{1}+ (n-1) d \ge 1,000$

Setting $a_{1} = 14$ and d = 13 and solving for :

$14 + (n-1) 13 \ge 1,000$

$14 + 13n-13 \ge 1,000$

$13n+1 \ge 1,000$

$13n+1 - 1 \ge 1,000 - 1$

$13 n \ge 999$

$13 n \div 13 \ge 999 \div 13$

$n \ge 76\frac{11}{13}$

Therefore, the 77th term, or $a_{77}$ , is the first element in the sequence greater than 1,000. Substituting n = 77 , $a_{1} = 14$ , and d = 13 in the rule and evaluating:

$a_{77}=a_{1}+ (n-1) d$

= 14+ (77-1) 13

$= 14+76 \cdot 13$

= 14+988

=1,002 ,

the correct choice.

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Example Question #33 : Sequences

$\small 2, 3, 5, 9, 17, x, 65, 129....$

$\small \textup{In the above number sequence, what is the value of}\,x?$

Possible Answers:

$\small 32$

$\small 33$

$\small 34$

$\small 35$

$\small 31$

Correct answer:

$\small 33$

Explanation:

Each term in the sequence is one less than twice the previous term.

So, $\small x=2\left ( 17\right )-1$

$\small x=33$

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Example Question #802 : Arithmetic

What is the next number in the following series: 0, 3, 8, 15, 24 . . . ?

Possible Answers:

Correct answer:

Explanation:

The series is defined by n² – 1 starting at n = 1. The sixth number in the series then equal to 6² – 1 = 35.

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Example Question #1 : How To Find The Next Term In An Arithmetic Sequence

A sequence of numbers is as follows:

3, 8, 18, 38, 78, . . .

What is the sum of the first seven numbers in the sequence?

Possible Answers:

490

1529

719

621

248

Correct answer:

621

Explanation:

The pattern of the sequence is (x+1) * 2.

We have the first 5 terms, so we need terms 6 and 7:

(78+1) * 2 = 158

(158+1) * 2 = 318

3 + 8 + 18 +38 + 78 + 158 + 318 = 621

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Example Question #1 : How To Find The Next Term In An Arithmetic Sequence

Find the next term of the following sequence:

267, 256, 245, 234, 223,...

Possible Answers:

212

213

More information is needed

210

211

Correct answer:

212

Explanation:

The sequence provided is arithmetic. An arithmetic sequence has a common difference between each consecutive term. In this case, the difference is ; therefore, the next term is 212 .

You can also use a formula to find the next term of an arithmetic sequence:

$a_{n}=a_{n-1}+d$

where the current term and d = the common difference.

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Example Question #5 : How To Find The Next Term In An Arithmetic Sequence

Solve each problem and decide which is the best of the choices given.

Find the sixth term in the following arithmetic sequence.
$\frac{1}{4},\frac{1}{8},0...$

Possible Answers:

$\frac{3}{8}$

$-\frac{1}{8}$

$-\frac{1}{4}$

$-\frac{3}{8}$

Correct answer:

$-\frac{3}{8}$

Explanation:

First find the common difference of the sequence,

$\frac{1}{4}-\frac{1}{8}=\frac{1}{8}$

$\frac{1}{8}-0=\frac{1}{8}$

Thus there is a common difference of

$\frac{1}{8}$ between each term,

so follow that pattern for another terms, and the result is $-\frac{3}{8}$ .

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Example Question #6 : How To Find The Next Term In An Arithmetic Sequence

Find the missing number in the sequence:

3, 9, 27, X , 243

Possible Answers:

112

Correct answer:

Explanation:

The pattern of this sequence is 3^n where represents the position of the number in the sequence.

3^n = 3^1 = 3 for the first number in the sequence.

3^2 = 9 for the second number.

3^3 = 27

For the fourth term, n=4 . Therefore, 3^4 = 81 .

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SAT Math : Arithmetic

Study concepts, example questions & explanations for SAT Math

All SAT Math Resources

Example Questions

Example Question #7 : Nth Term Of An Arithmetic Sequence

Example Question #3 : How To Find The Nth Term Of An Arithmetic Sequence

Example Question #7 : Nth Term Of An Arithmetic Sequence

Example Question #21 : Arithmetic Sequences

Example Question #33 : Sequences

Example Question #802 : Arithmetic

Example Question #1 : How To Find The Next Term In An Arithmetic Sequence

Example Question #1 : How To Find The Next Term In An Arithmetic Sequence

Example Question #5 : How To Find The Next Term In An Arithmetic Sequence

Example Question #6 : How To Find The Next Term In An Arithmetic Sequence

All SAT Math Resources

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