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SSC CHSL 2027 Missing Number Questions: Tricks & Practice Set
1/11/2026
SSC CHSL 2027 Missing Number Questions: Tricks & Practice Set
Missing Number questions are an important part of logical reasoning practice for competitive examinations. These questions test your ability to identify number patterns, understand mathematical relationships and find the value that completes a given series or arrangement.
For SSC CHSL 2027 preparation, candidates should practise number sequences, addition and subtraction patterns, multiplication, squares and other basic number relationships. This guide covers useful tricks, solved examples and practice questions.
1. What Are Missing Number Questions?
Missing Number questions contain a sequence, arrangement or pattern in which one number is missing. Candidates must identify the relationship between the given numbers and calculate the missing value.
Example:
2, 4, 6, 8, ?
Answer: 10
Explanation: Each number increases by 2.
2. Common Types of Missing Number Patterns
A. Addition Pattern
Numbers increase by adding a fixed value.
Example: 5, 10, 15, 20, ?
Answer: 25 (+5 each time)
B. Subtraction Pattern
Numbers decrease by subtracting a fixed value.
Example: 50, 45, 40, 35, ?
Answer: 30 (−5 each time)
C. Multiplication Pattern
Each number is multiplied by a fixed number.
Example: 3, 6, 12, 24, ?
Answer: 48 (×2 each time)
D. Square Number Pattern
Some questions are based on squares of natural numbers.
Example: 1, 4, 9, 16, ?
Answer: 25 (1², 2², 3², 4², 5²)
E. Increasing Difference Pattern
The difference between consecutive numbers may increase regularly.
Example: 2, 5, 9, 14, 20, ?
Answer: 27 (differences are +3, +4, +5, +6, +7)
F. Mixed Operations
Some patterns use more than one mathematical operation, such as multiplication followed by addition.
Example: 2, 5, 11, 23, ?
Answer: 47 (multiply by 2 and add 1 each time)
3. Step-by-Step Method to Find Missing Numbers
- Observe the numbers: Read the complete sequence or arrangement carefully.
- Check the differences: Subtract consecutive numbers to identify an addition or subtraction pattern.
- Check multiplication and division: Look for repeated multiplication or division relationships.
- Identify special patterns: Check squares, cubes, even numbers and odd numbers.
- Try mixed operations: If a simple pattern is not visible, check combinations of operations.
- Verify the answer: Apply the identified rule to all available numbers before selecting an option.
4. Solved Missing Number Examples
Example 1: 7, 14, 21, 28, ?
Solution: Each number increases by 7.
Answer: 35
Example 2: 4, 9, 19, 39, ?
Solution: Multiply by 2 and add 1.
4 × 2 + 1 = 9; 9 × 2 + 1 = 19; 19 × 2 + 1 = 39.
Answer: 79
Example 3: 81, 64, 49, 36, ?
Solution: These are descending squares: 9², 8², 7², 6².
Answer: 25 (5²)
5. SSC CHSL 2027 Missing Number Practice Questions
Choose the correct option for each question.
Q1. 3, 6, 9, 12, ?
A. 14
B. 15
C. 16
D. 18
Q2. 2, 4, 8, 16, ?
A. 24
B. 28
C. 32
D. 36
Q3. 100, 90, 80, 70, ?
A. 50
B. 55
C. 60
D. 65
Q4. 1, 4, 9, 16, 25, ?
A. 30
B. 32
C. 36
D. 49
Q5. 2, 5, 10, 17, 26, ?
A. 35
B. 36
C. 37
D. 38
Q6. 5, 10, 20, 40, ?
A. 60
B. 70
C. 80
D. 90
Q7. 64, 32, 16, 8, ?
A. 2
B. 4
C. 6
D. 10
Q8. 3, 7, 15, 31, ?
A. 47
B. 55
C. 63
D. 65
Q9. 11, 22, 33, 44, ?
A. 50
B. 55
C. 60
D. 66
Q10. 1, 8, 27, 64, ?
A. 100
B. 115
C. 125
D. 144
Answer Key with Explanations
| Q. | Answer | Explanation |
|---|---|---|
| 1 | B. 15 | Add 3 to each number. |
| 2 | C. 32 | Multiply each number by 2. |
| 3 | C. 60 | Subtract 10 each time. |
| 4 | C. 36 | The sequence contains consecutive squares; next is 6². |
| 5 | C. 37 | Differences are +3, +5, +7, +9 and +11. |
| 6 | C. 80 | Multiply each number by 2. |
| 7 | B. 4 | Divide each number by 2. |
| 8 | C. 63 | Multiply by 2 and add 1. |
| 9 | B. 55 | Add 11 to each number. |
| 10 | C. 125 | These are consecutive cubes: 1³, 2³, 3³, 4³, 5³. |
6. Preparation Tips for SSC CHSL 2027
- Revise multiplication tables, squares and cubes.
- Practise number series with different patterns.
- Learn to calculate differences quickly.
- Start with simple patterns before attempting mixed operations.
- Check the complete sequence instead of guessing from two numbers.
- Practise timed reasoning questions to improve speed and accuracy.
Prepare for SSC CHSL 2027 with Katara Academy
Missing Number questions become easier when you learn to recognise number relationships and apply basic mathematical operations. Practise different patterns regularly and revise your mistakes to strengthen your reasoning preparation.
Explore reasoning preparation courses at Katara Academy.
Frequently Asked Questions (FAQs)
1. What are missing number questions in reasoning?
These questions contain an incomplete number sequence or arrangement. Candidates must identify the pattern and calculate the missing value.
2. Which patterns should I practise for missing number questions?
Practise addition, subtraction, multiplication, division, squares, cubes, increasing differences and mixed operations.
3. How can I solve missing number questions faster?
Check differences first, then multiplication or division, followed by special number patterns. Verify the rule across the complete sequence.
4. Are squares and cubes useful in number reasoning?
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