1. Find the next number in the series: 49, 59, 69, 79, 89, ?
- A99
- B84
- C74
- D79
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Answer: A
Each term increases by 10. Next term = 89 + 10 = 99.
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Number Series — Quantitative Aptitude Questions & Practice
Practise 52 Number Series questions from Quantitative Aptitude for competitive exams such as UPSC, Banking, SSC and Railway. Read the worked questions below, check every answer with an explanation, and track what you get wrong.
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Practice questions on Number Series — with answers
Try each question first, then open the answer. Explanations are included.
2. Find the next number in the series: 42, 50, 58, 66, 74, ?
- A66
- B97
- C70
- D82
Show answer
Answer: D
Each term increases by 8. Next term = 74 + 8 = 82.
3. Find the next number in the series: 3, 1, 4, 5, 9, ?
- A4
- B14
- C24
- D6
Show answer
Answer: B
Each term is the sum of the two preceding terms. Next term = 9 + 5 = 14.
4. Find the next number in the series: 4, 2, 6, 8, 14, ?
- A20
- B22
- C26
- D42
Show answer
Answer: B
Each term is the sum of the two preceding terms. Next term = 14 + 8 = 22.
5. Find the next number in the series: 8, 27, 64, 125, 216, ?
- A309
- B377
- C257
- D343
Show answer
Answer: D
The series follows cubes of consecutive numbers starting 2. Next term = 7^3 = 343.
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