Number Series Questions and Answers


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Find the number that fits somewhere into the middle of the series. Some of the items involve both numbers and letters

Look at this series: F2, __, D8, C16, B32, ... What number should fill the blank?


A. A16
B. G4
C. E4
D. E3

Answer & Explanation:

Answer: Option C

Explanation: The letters decrease by 1; the numbers are multiplied by 2.



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Look at this series: 664, 332, 340, 170, ____, 89, ... What number should fill the blank?


A. 85
B. 97
C. 109
D. 178

Answer & Explanation:

Answer: Option D

Explanation: This is an alternating division and addition series: First, divide by 2, and then add 8.



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Look at this series: V, VIII, XI, XIV, __, XX, ... What number should fill the blank?


A. IX
B. XXIII
C. XV
D. XVII

Answer & Explanation:

Answer: Option D

Explanation: This is a simple addition series; each number is 3 more than the previous number.



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Look at this series: 70, 71, 76, __, 81, 86, 70, 91, ... What number should fill the blank?


A. 70
B. 71
C. 80
D. 96

Answer & Explanation:

Answer: Option A

Explanation: In this series, 5 is added to the previous number; the number 70 is inserted as every third number.



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Look at this series: 8, 43, 11, 41, __, 39, 17, ... What number should fill in the blank?


A. 8
B. 14
C. 43
D. 44

Answer & Explanation:

Answer: Option B

Explanation: This is a simple alternating addition and subtraction series. The first series begins with 8 and adds 3; the second begins with 43 and subtracts 2.



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