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: 21, 9, 21, 11, 21, 13, 21, ... What number should come next?


A. 14
B. 15
C. 21
D. 23

Answer & Explanation:

Answer: Option B

Explanation: In this alternating repetition series, the random number 21 is interpolated every other number into an otherwise simple addition series that increases by 2, beginning with the number 9.



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Look at this series: 58, 52, 46, 40, 34, ... What number should come next?


A. 26
B. 28
C. 30
D. 32

Answer & Explanation:

Answer: Option B

Explanation: This is a simple subtraction series. Each number is 6 less than the previous number.



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Look at this series: 3, 4, 7, 8, 11, 12, ... What number should come next?


A. 7
B. 10
C. 14
D. 15

Answer & Explanation:

Answer: Option D

Explanation: This alternating addition series begins with 3; then 1 is added to give 4; then 3 is added to give 7; then 1 is added, and so on.



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Look at this series: 8, 22, 8, 28, 8, ... What number should come next?


A. 9
B. 29
C. 32
D. 34

Answer & Explanation:

Answer: Option D

Explanation: This is a simple addition series with a random number, 8, interpolated as every other number. In the series, 6 is added to each number except 8, to arrive at the next number.



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Look at this series: 31, 29, 24, 22, 17, ... What number should come next?


A. 15
B. 14
C. 13
D. 12

Answer & Explanation:

Answer: Option A

Explanation: This is a simple alternating subtraction series, which subtracts 2, then 5.



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