Practice Number Series with this set of 60 questions. These questions are useful for Aptitude and Reasoning exams. You will see common numerical and arithmetic series patterns. Try each question first, then check the answers and solutions. It’s a simple way to improve speed and accuracy in series questions.
For more aptitude questions across different chapters, jump here: aptitude question and answers.
Number Series Questions with Solutions (Aptitude + Reasoning Series Test)
Arithmetic / Difference Series: 20 MCQ Questions
Question 1. Find the next number in the series: 5, 9, 13, 17, ___
a) 19
b) 21
c) 23
d) 25
Answer:
b) 21
Question 2. Find the next number in the series: 40, 37, 34, 31, ___
a) 30
b) 28
c) 27
d) 26
Answer:
b) 28
Question 3. Find the next number in the series: 3, 8, 13, 18, ___
a) 21
b) 22
c) 23
d) 24
Answer:
c) 23
Question 4. Find the next number in the series: 100, 93, 86, 79, ___
a) 74
b) 73
c) 72
d) 71
Answer:
b) 72
Question 5. Find the next number in the series: 2, 5, 9, 14, 20, ___
a) 25
b) 26
c) 27
d) 28
Answer:
c) 27
Question 6. Find the next number in the series: 1, 4, 9, 16, 25, ___
a) 30
b) 32
c) 34
d) 36
Answer:
d) 36
Question 7. Find the next number in the series: 12, 15, 19, 24, 30, ___
a) 35
b) 36
c) 37
d) 38
Answer:
c) 37
Question 8. Find the next number in the series: 50, 47, 43, 38, 32, ___
a) 26
b) 27
c) 28
d) 29
Answer:
a) 26
Question 9. Find the next number in the series: 7, 14, 12, 19, 17, ___
a) 22
b) 24
c) 25
d) 26
Answer:
b) 24
Question 10. Find the next number in the series: 2, 6, 4, 8, 6, 10, ___
a) 6
b) 7
c) 8
d) 9
Answer:
c) 8
Question 11. Find the next number in the series: 30, 28, 26, 23, 21, 19, ___
a) 18
b) 17
c) 16
d) 15
Answer:
c) 16
Question 12. Find the next number in the series: 4, 11, 18, 25, ___
a) 30
b) 31
c) 32
d) 33
Answer:
c) 32
Question 13. Find the next number in the series: 9, 7, 10, 8, 11, 9, ___
a) 10
b) 11
c) 12
d) 13
Answer:
c) 12
Question 14. Find the next number in the series: 1, 3, 6, 10, 15, ___
a) 18
b) 19
c) 20
d) 21
Answer:
d) 21
Question 15. Find the next number in the series: 60, 55, 49, 42, 34, ___
a) 26
b) 27
c) 28
d) 29
Answer:
a) 26
Question 16. Find the next number in the series: 8, 13, 19, 26, 34, ___
a) 41
b) 42
c) 43
d) 44
Answer:
c) 43
Question 17. Find the next number in the series: 15, 12, 16, 13, 17, 14, ___
a) 16
b) 17
c) 18
d) 19
Answer:
c) 18
Question 18. Find the next number in the series: 6, 10, 15, 21, 28, ___
a) 34
b) 35
c) 36
d) 37
Answer:
b) 35
Question 19. Find the next number in the series: 90, 81, 73, 66, 60, ___
a) 55
b) 54
c) 53
d) 52
Answer:
b) 54
Question 20. Find the next number in the series: 11, 22, 20, 31, 29, ___
a) 38
b) 39
c) 40
d) 41
Answer:
b) 39
Multiplicative / Ratio Series: 20 MCQ Questions
Question 1. Find the next number in the series: 64, 32, 16, 8, ___
a) 2
b) 3
c) 4
d) 6
Answer:
c) 4
Question 2. Find the next number in the series: 3, 6, 12, 24, ___
a) 36
b) 40
c) 44
d) 48
Answer:
d) 48
Question 3. Find the next number in the series: 5, 15, 45, 135, ___
a) 270
b) 360
c) 405
d) 540
Answer:
c) 405
Question 4. Find the next number in the series: 81, 27, 9, 3, ___
a) 1
b) 2
c) 3
d) 4
Answer:
a) 1
Question 5. Find the next number in the series: 2, 4, 12, 24, 72, ___
a) 96
b) 120
c) 144
d) 216
Answer:
d) 216
Question 6. Find the next number in the series: 1, 2, 6, 24, ___
a) 48
b) 96
c) 120
d) 144
Answer:
c) 120
Question 7. Find the next number in the series: 7, 14, 28, 56, ___
a) 84
b) 98
c) 112
d) 126
Answer:
c) 112
Question 8. Find the next number in the series: 100, 50, 25, 12.5, ___
a) 5.25
b) 6.25
c) 7.25
d) 8.25
Answer:
b) 6.25
Question 9. Find the next number in the series: 4, 12, 36, 108, ___
a) 216
b) 324
c) 432
d) 486
Answer:
c) 324
Question 10. Find the next number in the series: 9, 18, 54, 108, ___
a) 216
b) 270
c) 288
d) 324
Answer:
a) 216
Question 11. Find the next number in the series: 2, 8, 32, 128, ___
a) 256
b) 384
c) 512
d) 640
Answer:
c) 512
Question 12. Find the next number in the series: 10, 5, 20, 10, 40, ___
a) 15
b) 20
c) 25
d) 30
Answer:
b) 20
Question 13. Find the next number in the series: 6, 3, 6, 3, 6, ___
a) 1
b) 2
c) 3
d) 4
Answer:
c) 3
Question 14. Find the next number in the series: 11, 22, 44, 88, ___
a) 99
b) 132
c) 144
d) 176
Answer:
d) 176
Question 15. Find the next number in the series: 1, 3, 9, 27, ___
a) 54
b) 72
c) 81
d) 243
Answer:
d) 81
Question 16. Find the next number in the series: 16, 8, 4, 2, ___
a) 0.25
b) 0.5
c) 1
d) 1.5
Answer:
c) 1
Question 17. Find the next number in the series: 3, 9, 18, 54, 108, ___
a) 162
b) 216
c) 324
d) 432
Answer:
b) 216
Question 18. Find the next number in the series: 12, 6, 18, 9, 27, ___
a) 10
b) 11
c) 12
d) 13.5
Answer:
d) 13.5
Question 19. Find the next number in the series: 5, 10, 8, 16, 14, ___
a) 26
b) 28
c) 30
d) 32
Answer:
b) 28
Question 20. Find the next number in the series: 2, 5, 10, 17, 26, ___
a) 35
b) 36
c) 37
d) 38
Answer:
b) 37
Mixed / Structured Series (Interleaving + Alpha-numeric): 20 MCQ Questions
Question 1. Find the next number in the series: 2, 10, 4, 8, 6, 6, ___
a) 4
b) 6
c) 8
d) 10
Answer:
c) 8
Question 2. Find the next two numbers in the series: 28, 25, 5, 21, 18, 5, 14, ___, ___
a) 12, 5
b) 11, 5
c) 10, 7
d) 11, 8
Answer:
b) 11, 5
Question 3. Find the next number in the series: 1, 4, 2, 8, 3, 12, ___
a) 4
b) 14
c) 16
d) 20
Answer:
a) 4
Question 4. Find the next number in the series: 9, 1, 8, 2, 7, 3, ___
a) 4
b) 5
c) 6
d) 7
Answer:
c) 6
Question 5. Find the next number in the series: A1, B2, C4, D8, ___
a) E10
b) E12
c) E16
d) F16
Answer:
c) E16
Question 6. Find the missing term in the series: F2, ___, D8, C16, B32
a) E2
b) E4
c) E6
d) G4
Answer:
b) E4
Question 7. Find the next number in the series: 3, 6, 2, 8, 1, 10, ___
a) 0
b) 1
c) 2
d) 3
Answer:
a) 0
Question 8. Find the next number in the series: 11, 22, 12, 24, 13, 26, ___
a) 14
b) 27
c) 28
d) 29
Answer:
a) 14
Question 9. Find the next number in the series: 5, 100, 10, 50, 15, 25, ___
a) 20
b) 12.5
c) 30
d) 18
Answer:
a) 20
Question 10. Find the next number in the series: 1, 2, 1, 4, 1, 8, ___
a) 1
b) 2
c) 4
d) 16
Answer:
a) 1
Question 11. Find the next number in the series: 20, 19, 18, 16, 15, 14, ___
a) 13
b) 12
c) 11
d) 10
Answer:
b) 12
Question 12. Find the next number in the series: 2, 3, 5, 8, 12, 17, ___
a) 21
b) 22
c) 23
d) 24
Answer:
c) 23
Question 13. Find the next number in the series: 6, 1, 5, 2, 4, 3, ___
a) 3
b) 4
c) 2
d) 1
Answer:
d) 1
Question 14. Find the next number in the series: Z2, Y4, X8, W16, ___
a) V24
b) V32
c) U32
d) V64
Answer:
b) V32
Question 15. Find the next two numbers in the series: 42, 40, 38, 35, 33, 31, 28, ___, ___
a) 26, 24
b) 25, 23
c) 26, 22
d) 24, 22
Answer:
a) 26, 24
Question 16. Find the next number in the series: 2, 7, 3, 8, 4, 9, ___
a) 5
b) 6
c) 10
d) 11
Answer:
a) 5
Question 17. Find the next number in the series: 15, 3, 14, 4, 13, 5, ___
a) 12
b) 6
c) 11
d) 7
Answer:
a) 12
Question 18. Find the next number in the series: 4, 9, 5, 8, 6, 7, ___
a) 5
b) 6
c) 7
d) 4
Answer:
d) 4
Question 19. Find the next number in the series: 1, 3, 2, 6, 3, 9, 4, ___
a) 10
b) 11
c) 12
d) 13
Answer:
c) 12
Question 20. Find the missing term in the series: C3, E6, G12, I24, ___
a) J48
b) K48
c) K36
d) L48
Answer:
b) K48
