Exercise: Number Series

Questions for: Number Series

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: B
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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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: A
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: V, VIII, XI, XIV, __, XX, ... What number should fill the blank?
A:
IX
B:
XXIII
C:
XV
D:
XVII
Answer: D
This is a simple addition series; each number is 3 more than the previous number.
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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: D
This is an alternating division and addition series: First, divide by 2, and then add 8.
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Look at this series: F2, __, D8, C16, B32, ... What number should fill the blank?
A:
A16
B:
G4
C:
E4
D:
E3
Answer: C
The letters decrease by 1; the numbers are multiplied by 2.
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