Coding Decoding Questions for Reasoning 2025 – Tricks, Types & Examples

Coding Decoding is one of the most common topics in the reasoning section of competitive exams like SSC, IBPS, RRB, UPSC, and state-level tests. The questions test your logical thinking, pattern recognition, and decoding ability. With the right tricks and regular practice, you can easily score full marks in this section.

In this blog, you’ll learn all the important types, easy tricks, solved examples, and exam-level practice questions to help you master coding-decoding in 2025.

Introduction: Why Coding Decoding Is Important

In every major government exam, reasoning questions hold high weightage. Coding decoding questions appear in both preliminary and mains exams. This topic is known for being:

  • Scoring and quick to solve
  • Based on logical patterns and sequences
  • Repeated with minor variations in exams

By learning the most asked formats and practicing regularly, you can confidently attempt all questions without wasting time.

Basic to Advanced Coding Decoding Types

There are different types of coding-decoding questions. Let’s go through the most common ones that appear in exams.

1. Letter Coding

Each letter in the word is replaced with another letter using a certain rule or shift.

Example: If WORK is coded as ZRUN, how is HARD coded?

Solution: W(+3) → Z, O(+3) → R, R(+3) → U, K(+3) → N → Rule: +3 shift

H(+3) → K, A(+3) → D, R(+3) → U, D(+3) → G → Answer: KDUG

2. Number Coding

Words are coded using numbers based on position, reverse values, or mathematical logic.

Example: If BAG = 2147, how is CAT coded?

Logic: Use A=1, B=2, C=3, etc.

  • B = 2, A = 1, G = 7 → BAG = 2147
  • C = 3, A = 1, T = 20 → CAT = 31120

3. Symbol Coding

Every word or letter is represented using symbols.

Example: If ‘APPLE’ is coded as ‘$@#*&’, what is the code for ‘PEAL’?

Solution: Match each letter: P = #, E = , A = $, L = & → **Answer: #$&**

4. Decoding Based on Common Logic

Words or sentences are coded using a logic hidden in a pattern, reverse, or mathematical formula.

Example: If BOY = 25, CAT = 24, DOG = ?

Logic: Add position of letters: D(4)+O(15)+G(7) = 26 → Answer: 26

Shortcut Tricks to Crack Reasoning Questions

Use these smart tricks to solve coding-decoding questions faster:

Trick 1: Alphabet Positioning

  • A = 1, B = 2, …, Z = 26
  • Reverse: Z = 1, Y = 2, …, A = 26

Trick 2: Observe Shift Patterns

  • Look for consistent + or – shifts in letters (e.g., +2, -3)
  • Try mapping input-output letter by letter

Trick 3: Compare Multiple Examples

  • If 2-3 words are given with codes, find repeating logic or letters
  • Eliminate unrelated options first

Trick 4: Use Substitution Tables

Create a table to map letters or numbers if a long sentence is coded.

LetterCode
A*
B#
C$

Trick 5: Backward Reading

  • Check if letters are reversed or placed from end to start
  • E.g., ‘RAT’ → ‘TAR’

Top 10 Coding Decoding Questions with Solutions

Here are exam-level practice questions you can try:

Q1. If TREE is coded as USFF, how is LEAF coded?

Answer: MFBG (Each letter +1)

Q2. In a code, MONDAY is written as NPOEBZ. What is SUNDAY?

Answer: TVOEBZ (Each letter +1)

Q3. If COLD = 3-15-12-4, how is WARM coded?

Answer: 23-1-18-13

Q4. If PEN = 16-5-14, then HEN = ?

Answer: 8-5-14

Q5. If GOOD is 71215, what is BAD?

Answer: 214

Q6. If CAT = 24 and DOG = 26, then FOX = ?

Answer: 45

Q7. If ROSE = 6821 and SEAT = 8210, what is EATS?

Answer: 1028

Q8. What comes next in the series: A1, B2, C3, D4, ?

Answer: E5

Q9. If NEWS = 91452319, then WENS = ?

Answer: 14923195

Q10. If S = 19, K = 11, U = 21, what is the sum of S+K+U?

Answer: 51

Topic-wise Practice Set (With Answers)

Question TypeExample QuestionAnswer
Letter CodingSKY → TZB+1 shift
Number CodingPEN = 16514Mapping
Symbol CodingCAT → @$#Match set
Substitution CodingRAT = 321Table match
Sentence Coding“I am fine” → “X Y Z”Word code

Try creating similar questions to test your understanding.

Mistakes Students Commonly Make

  • Ignoring basic alphabet positions
  • Forgetting reverse logic
  • Not comparing letter-by-letter changes
  • Rushing through multi-word codes
  • Skipping sentence-based coding practice

Avoid these to reduce errors and save time in the exam.

FAQs & Exam Tips

Q1. How many coding decoding questions are asked in exams?

Usually 3–5 questions appear in the reasoning section.

Q2. What’s the best way to prepare for this topic?

Practice daily using topic-wise sets, and revise common letter-number mappings.

Q3. Are tricks allowed in exams?

Yes, you should use logical shortcuts—but avoid guesswork.

Q4. Should I skip lengthy questions?

No. Practice speed-reading and identifying logic quickly.

Q5. Can I expect coding-decoding in UPSC?

Yes, basic reasoning sections include such questions in prelims.

Q6. What book or source should I follow?

Use books like R.S. Aggarwal, and daily reasoning quizzes on apps or sites.

Final Thoughts

Coding-Decoding is a scoring topic when prepared smartly. Whether you’re aiming for SSC, IBPS, UPSC, or any state-level exam in 2025, mastering this reasoning section can make a big difference.

Use the tricks shared, solve daily practice questions, and keep your basics clear. For more reasoning guides, free mock tests, and job alerts, follow Thenewviews.com—your trusted exam partner.

Stay ahead. Stay prepared. Crack reasoning like a pro!

Author

  • Saroj Kanwar

    Saroj Kanwar is the SEO Manager and Content Writer at TheNewViews.com, where she shares simple and useful updates on exams, internships, careers, and tech trends. She combines her writing skills with SEO strategies to create content that’s both helpful and easy to find.

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