Letter Coding
Each letter moves +1 or +2 — code a new word the same way.
Letter Coding
Letter Coding
What you'll learn
- Each letter shifts +1 or +2 forward in alphabet.
- Apply same rule to code a new word.
- Write alphabet strip — mark shifts with arrows.
- Decode by shifting backward same steps.
Key concepts
Level 1 — Core idea
Verbal: CAT → DBU means each letter moved +1.
Symbolic: C→D, A→B, T→U; rule +1 on all letters.
Visual: Alphabet strip with curved arrow +1 under each letter.
Level 2 — Going deeper
If only some letters shift, rule may differ — Class 3 usually same shift for all. Check coded example before coding new word.
NCERT anchor
NCERT Class 3 English alphabet order is essential. Practice A=1 to Z=26 for harder papers.
Worked example
If DOG → EPH (+1), code CAT same way.
Step 1 — Rule confirmed: **+1** each letter
Step 2 — C→D, A→B, T→U
Answer: **DBU** ✓
Decode: KHOOR (+3 backward from HELLO?)
Step 1 — If HELLO → KHOOR, each letter +3 forward
Step 2 — To decode KHOOR → shift **−3** each
Step 3 — Back to **HELLO** ✓
Common mistakes
| Mistake | Why | Fix |
|---|---|---|
| Different shift per letter without reason | Random coding | Find one rule from example |
| Skip Z wrap | Z+1=A intro missed | After Z → A if needed |
| Reverse wrong direction | Decode + instead of − | Coding forward → decode backward |
| Only change first letter | Lazy pattern | Shift every letter |
Quick check
- SUN → TVO — what shift?
- Code PEN with +2.
- Decode one step −1 from Q.
- Stretch: Code your name with +1 — peer decodes.
Revision tip: Write original and coded letters in two rows — compare gaps.
Open the Practice tab for graded questions on Letter Coding.
Key Takeaways (TL;DR)
- What you'll learn
- Key concepts
- Worked example
- Common mistakes
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