Number Series Questions and Answers


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In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much

Look at this series: 2, 1, (1/2), (1/4), ... What number should come next?


A. (1/3)
B. (1/8)
C. (2/8)
D. (1/16)

Answer & Explanation:

Answer: Option B

Explanation: This is a simple division series; each number is one-half of the previous number. In other terms to say, the number is divided by 2 successively to get the next result.

4/2 = 2

2/2 = 1

1/2 = 1/2

(1/2)/2 = 1/4

(1/4)/2 = 1/8 and so on.



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Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?


A. 7
B. 10
C. 12
D. 13

Answer & Explanation:

Answer: Option B

Explanation: This is a simple alternating addition and subtraction series. In the first pattern, 3 is added; in the second, 2 is subtracted.



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Look at this series: 36, 34, 30, 28, 24, ... What number should come next?


A. 20
B. 22
C. 23
D. 26

Answer & Explanation:

Answer: Option B

Explanation: This is an alternating number subtraction series. First, 2 is subtracted, then 4, then 2, and so on.



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Look at this series: 22, 21, 23, 22, 24, 23, ... What number should come next?


A. 22
B. 24
C. 25
D. 26

Answer & Explanation:

Answer: Option C

Explanation: In this simple alternating subtraction and addition series; 1 is subtracted, then 2 is added, and so on.



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Look at this series: 53, 53, 40, 40, 27, 27, ... What number should come next?


A. 12
B. 14
C. 27
D. 53

Answer & Explanation:

Answer: Option B Explanation:

In this series, each number is repeated, then 13 is subtracted to arrive at the next number.



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