40+ Number Series Questions | Logical Reasoning

Number Series questions are an important part of competitive exams, especially in the logical reasoning section. These questions present a series of numbers with a missing value that you need to fill in by identifying the already existing pattern. In the start, it may seem straightforward, but understanding the logic behind the pattern can be quite challenging. In this article, we will explore different types of number series, provide instructions on how to approach them, and offer 40 sample questions with solutions to help you ace these problems.

Types of Number Series Questions

Here we have categorized number series questions into the following types:

1. Series with Increasing Difference: This is the most common type, where the difference between consecutive numbers consistently increases.
2. Series with Constant Difference: In this type, the difference between each pair of successive numbers remains the same.
3. Series with Decreasing Difference: Here, the difference between consecutive numbers decreases as you move along the series.
4. Perfect Squares and Cubes Series: These series involve the squares or cubes of numbers, either directly or indirectly.
5. Miscellaneous Series: This category includes series that may have various operations like addition, subtraction, multiplication, or division.

Also Read: Number Series Questions for Competitive Exams

Instructions to Solve Number Series Logical Reasoning Questions

To tackle number series questions effectively, you can employ several strategies:

1. Start by examining the differences between consecutive numbers. If you notice a consistent difference, it likely falls under the “constant difference” category.
2. If the differences themselves are increasing or decreasing, the series may belong to the “increasing difference” or “decreasing difference” category, respectively.
3. If differences don’t provide a clear answer, try dividing one number by the previous one. If the result is consistent, it might be a “product series.”
4. Express each term as a product of two factors and search for patterns among these factors.

Questions on Number Series Logical Reasoning With Detailed Explanations

Missing Terms Logical Reasoning Questions in the Series Section

Missing terms category is an important category under series section in logical reasoning.Here are some questions for practice:

Q1. Find the missing term: 2, 5, 12.5,? 78.125, 195.3125

Answer: 31.25

Q2. Find the missing term: 50, 45, 40, 35, 30,? 

Answer:25

Q3. Find the missing term: -10, -8, 6, 40, 102,?

Answer:117

Q4. Find the missing term: 25, 49, 121, 169,?

Answer:289

Q5. Find the missing term: 1, 30, 5, 26, 9, 22, 13, 18,?
Answer:17

Q6. Find the missing term: 4, 18,? 100, 180, 294, 448.

Answer:48

Q7. Find the missing term: 11,12,15,20,27,? 

Answer:36

Q8. Find the missing term: 14, 25, 47, 91, 179, ?.

Answer:55

Q9. Find the missing term: 4, 6, 9, 14, 21, ?.

Answer:32

Q10. Find the missing terms: 3, 4, 7, 8, 11, 12, ??. 

Answer:15,16

Q11. Find the wrong number: 2, 3, 12, 37, 86, 166, 288.

Answer:166

Q12. Find the missing term: 81: 101:: 121:?

Answer:145

Q13. Find the missing term: 11 : 121:: 15:?

Answer:225

Q14. Find the missing term: 2, 4, 8, 10, 14, ?.

Answer:116

Q15. Find the missing term: 1, 8, 9, 64, ?. 

Answer:25

Q16. Find the missing term: 6, 11, 18, 27, ?. 

Answer:38

Q17. Find the missing term: 3, 3, 4.5, 9, ?.

Answer:22

Q18. Find the missing term: 3, 5, 7, 9, 11, ?.

Answer:13

Q19. Find the missing term: 1, 7, 37, 187, 937, ?.

Answer:4687

Q20. Find the missing term: 1, 5, 19, 81, ?

Answer:411

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