# Number Series Questions and Answers updated daily – Aptitude

Number Series Questions: Solved 1295 Number Series Questions and answers section with explanation for various online exam preparation, various interviews, Aptitude Category online test. Category Questions section with detailed description, explanation will help you to master the topic.

## Number Series Questions

101. Find the missing number.
1000, 501, 170, 47.5, ?

Correct Ans:16.5
Explanation:
The pattern is,
(1000/2) + 1 = 501
(501/3) + 3 = 170
(170/4) + 5 = 47.5
(47.5/5) + 7 = 16.5
16.5 is the required number.
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102. Find the missing number.
6, 4, 5, 11, ?, 189

Correct Ans:39
Explanation:
The pattern is,
(6*1) - 2 = 4
(4*2) - 3 = 5
(5*3) - 4 = 11
(11*4) - 5 = 39
(39*5) - 6 = 189
39 is the required number.
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103. Find the missing number.
18, 27, 9, 36, 0, ?

Correct Ans:45
Explanation:
The pattern is,
18 + (9 * 1) = 27
27 - (9 * 2) = 9
9 + (9 * 3) = 36
36 - (9 * 4) = 0
0 + (9 * 5) = 45
45 is the required number.
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104. Find the missing number.

9, 12, 19, 34, 65, ?

Correct Ans:128
Explanation:
Pattern:
22 + 5 = 9
23 + 4 = 12
24 + 3 = 19
25 + 2 = 34
26 + 1 = 65
27 + 0 = 128
Hence, the missing number is 128.
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105. Find the missing number.

5, 15, 33, 57, 85, ?

Correct Ans:115
Explanation:
Pattern:
5
5 + (10*1) = 15
15 + (9*2) = 33
33 + (8*3) = 57
57 + (7*4) = 85
85 + (6*5) = 115
Hence, the missing number is 115.
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106. Find the missing number.

1, 6, 36, 240, 1960, ?

Correct Ans:19660
Explanation:
Pattern:
(1*2) + (2*2) = 6
(6*4) + (3*4) = 36
(36*6) + (4*6) = 240
(240*8) + (5*8) = 1960
(1960*10) + (6*10) = 19660
Hence, the missing number is 19660.
Workspace

107. Find the missing number.

17, 22, 33, 42, 61, ?

Correct Ans:74
Explanation:
Pattern:
17
17 + 3*2 â€“ 1 = 22
22 + 3*3 + 2 = 33
33 + 3*4 â€“ 3 = 42
42 + 3*5 + 4 = 61
61 + 3*6 â€“ 5 = 74
Hence, the missing number is 74.
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108. Find the missing number.
1953.125,781.25, 312.5, 125, ?, 20

Correct Ans:50
Explanation:
The pattern is,
1953.125/2.5 = 781.25
781.25/2.5 = 312.5
312.5/2.5 = 125
125/2.5 = 50
50/2.5 = 20
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109. Find the missing number.
4, 18, 48, 100, 180, 294, ?

Correct Ans:448
Explanation:
The pattern is,
4 = 2*2
18 = 3*6
48 = 4*12
100 = 5*20
180 = 6*30
294 = 7*42
448 = 8*56
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110. Find the missing number.
7, 9, 19, 45, 95, ?

Correct Ans:177
Explanation:
The pattern is,
7 + (12 + 1) = 9
9 + (32 + 1) = 19
19 + (52 + 1) = 45
45 + (72 + 1) = 95
95 + (92 + 1) = 177
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111. What should come in place of question mark in the following series?

126, 247, 416, 641, ?, 1291

Correct Ans:930
Explanation:
The pattern followed is:
126
126 + 112 = 247
247 + 132 = 416
416 + 152 = 641
641 + 172 = 930
930 + 192 = 1291
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112. Find the missing number.
2, 12, 36, 80, ?

Correct Ans:150
Explanation:
The pattern is,
13 + 12 = 1 + 1 = 2
23 + 22 = 8 + 4 = 12
33 + 32 = 27 + 9 = 36
43 + 42 = 64 + 16 = 80
53 + 52 = 125 + 25 = 150
Hence, 150 is the required answer.
Workspace

113. Find the missing number.
21, ?, 39, 183, 327

Correct Ans:30
Explanation:
The pattern is,
21 + (2 + 1)2 = 30
30 + (3 + 0)2 = 39
39 + (3 + 9)2 = 183
183 + (1 + 8 + 3)2 = 327
Hence, 30 is the required answer.
Workspace

114. Find the missing number.
32, 48, 24, 36, 18, ?

Correct Ans:27
Explanation:
The pattern is,
32 Ã— 1.5 = 48
48 Ã· 2 = 24
24 Ã— 1.5 = 36
36 Ã· 2 = 18
18 Ã— 1.5 = 27
Hence, 27 is the required answer.
Workspace

115. 2, 12, 36, 80, 150, ?

Correct Ans:252
Explanation:
Pattern: It is of the form (n3 + n2)
13 + 12 = 2
23 + 22 = 12
33 + 32 = 36
43 + 42 = 80
53 + 52 = 150
63 + 62 = 252
Workspace

116. Find the missing number.
420, 462, 506, 552, 600, 650, ?

Correct Ans:702
Explanation:
The pattern is :
20*21 = 420
21*22 = 462
22*23 = 506
23*24 = 552
24*25 = 600
25*26 = 650
26*27 = 702
Workspace

117. Find the missing number.
4, 6, 15, 49, 201, 1011, ?

Correct Ans:6073
Explanation:
The pattern is:
(4*1) + 2 = 6
(6*2) + 3 = 15
(15*3) + 4 = 49
(49*4) + 5 = 201
(201*5) + 6 = 1011
(1011*6) + 7 = 6073
Workspace

118. Find the missing number.
126, 64, ?, 20, 14, 12

Correct Ans:34
Explanation:
The pattern is,
126/2 + 1 = 64
64/2 + 2 = 34
34/2 + 3 = 20
20/2 + 4 = 14
14/2 + 5 = 12
Workspace

119. Find the missing number.
17, 9, ?, 16.5, 35, 90

Correct Ans:10
Explanation:
The pattern is,
17*0.5 + 0.5 = 9
9*1 + 1 = 10
10*1.5 + 1.5 = 16.5
16.5*2 + 2 = 35
35*2.5 + 2.5 = 90
Workspace

120. What will come in place of the question mark (?) in the following number series?
6, 16, 44, 126, 370, ?

Correct Ans:1100
Explanation:
Pattern:
6
(6*3) â€“ 2 = 16
(16*3) â€“ 4 = 44
(44*3) â€“ 6 = 126
(126*3) â€“ 8 = 370
(370*3) â€“ 10 =1100.
Workspace

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