SSC CHSL Reasoning Missing Number: Concepts, Tricks & Solved Examples

Preparing for the SSC CHSL Reasoning section requires a strong understanding of different question types, and Missing Number is one of the most important topics. These questions test a candidate's logical thinking, pattern recognition, and calculation skills by asking them to identify the missing value in a series or grid. Since this topic is frequently asked in SSC CHSL and other government exams, mastering it can help candidates improve both their accuracy and speed.

The SSC CHSL Reasoning Missing Number chapter covers a variety of number patterns involving arithmetic operations, squares, cubes, multiplication, division, and logical sequences. Regular practice, along with a strong grasp of basic mathematical concepts, enables candidates to solve these questions quickly and score well in the reasoning section.

Also Read: SSC CHSL Syllabus

What is Missing Number in Reasoning?

Missing Number is an important topic in the reasoning section of SSC CHSL, SSC CGL, RRB, and several other government examinations. 

This topic challenges candidates to identify hidden patterns and relationships within given number sets, often presented in grids or matrices, to deduce a missing value. Mastering this chapter requires a strong foundation in basic arithmetic and pattern recognition.

Prerequisites for Missing Number Problems

To excel in the Missing Number chapter, strong calculation skills are paramount. Students must memorise the following to quickly identify patterns:

• Tables: Up to 25

• Squares: Up to 25

• Cubes: Up to 35

• Factorials

• Prime Numbers

Chapter Overview & Importance of Calculation

The Missing Number chapter features questions presented in various formats, including different grid or matrix structures. 

Your success in solving these questions largely depends on strong calculation skills and the ability to identify numerical patterns quickly. 

If your calculations are weak, you will struggle significantly, as patterns often involve complex arithmetic, powers, or sequential logic that require rapid mental computation.

Exam Relevance

This chapter typically accounts for one to two questions in competitive exams like Railway and SSC.

• Railway exams: Often feature specific patterns.

• SSC exams: May present patterns that overlap with Railway, but can also include more complex structures.

• Verbal Reasoning is more prevalent in Railway exams compared to Non-Verbal Reasoning.

How to Solve SSC CHSL Missing Number Questions 

When approaching a missing number problem, especially in a grid format, a common point of confusion is whether to analyse horizontally or vertically. 

Always prioritise the direction (horizontal or vertical) where the sum of numbers is generally higher, as this often indicates the primary calculation flow. 

SSC CHSL Missing Number Solved Examples 

Practising solved examples is one of the best ways to master SSC CHSL Reasoning Missing Number questions. By analysing the pattern step by step, candidates can improve their calculation speed, strengthen their reasoning skills, and solve Missing Number questions more accurately during the examination.

Problem 1