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Number-Letter Codes - Advanced Level: reverse mapping ADVANCED

Master number-letter codes concepts through this hard problem set practice set. Worksheet 26 of 30 contains 20 advanced-level problems. Deep dive into reverse mapping while learning letter value codes, numeric equivalents, alphabet numbering. Recommended for advanced learners aiming for complex scenarios and multi-step problems.

📝 Worksheet 26 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Advanced level

What you'll learn in this worksheet:
Your progress through Number-Letter Codes
Worksheet 26 of 30 (86% complete)

Question 1

If each letter is shifted forward by 1 positions (A→B), what is 'CAR' coded as?
Shift coding: C→D(+1), A→B(+1), R→S(+1) → DBS
shift, caesar, cipher

Question 2

If each letter is shifted forward by 5 positions (A→F), what is 'PEN' coded as?
Shift coding: P→U(+5), E→J(+5), N→S(+5) → UJS
shift, caesar, cipher

Question 3

If vowels (A,E,I,O,U) are coded as 'V' and consonants as 'C', what is the code for 'EAGLE'?
Vowel/Consonant coding: E→V, A→V, G→C, L→C, E→V → VVCCV
vowel, consonant, pattern

Question 4

If each letter is coded as its ASCII value (A=65, B=66...), what is 'CAR' coded as?
ASCII coding: C=67, A=65, R=82 → concatenated = 676582
ascii, computer

Question 5

If each letter is coded as the square of its position (A=1→1, B=2→4, C=3→9...), what is 'BED' coded as?
Square coding: B=2²=4, E=5²=25, D=4²=16 → concatenated = 42516
square, exponential, advanced

Question 6

If letters are coded as 5-bit binary (A=1=00001, B=2=00010...), 'DOG' is coded as?
Binary coding: D=4=00100, O=15=01111, G=7=00111 → concatenated = 001000111100111
binary, advanced

Question 7

If each letter is coded as its ASCII value (A=65, B=66...), what is 'BAG' coded as?
ASCII coding: B=66, A=65, G=71 → concatenated = 666571
ascii, computer

Question 8

If letters are coded as (position mod 9), 'WORLD' becomes?
Modular coding: W=23%9=5, O=15%9=6, R=18%9=0, L=12%9=3, D=4%9=4 → concatenated = 56034
modular, advanced

Question 9

If each letter is coded as the square of its position (A=1→1, B=2→4, C=3→9...), what is 'EGG' coded as?
Square coding: E=5²=25, G=7²=49, G=7²=49 → concatenated = 254949
square, exponential, advanced

Question 10

For 'BAD', odd positions use reverse coding, even positions use shift coding. What is the result?
Alternating coding: B→25(rev), A→C(+2), D→23(rev) → 25C23
alternating, mixed, advanced

Question 11

For 'ACE', odd positions use shift coding, even positions use reverse coding. What is the result?
Alternating coding: A→C(+2), C→24(rev), E→G(+2) → C24G
alternating, mixed, advanced

Question 12

If each letter is coded as its ASCII value (A=65, B=66...), what is 'BAG' coded as?
ASCII coding: B=66, A=65, G=71 → concatenated = 666571
ascii, computer

Question 13

If letters are coded as 5-bit binary (A=1=00001, B=2=00010...), 'CAT' is coded as?
Binary coding: C=3=00011, A=1=00001, T=20=10100 → concatenated = 000110000110100
binary, advanced

Question 14

If A=2, B=3, C=5, D=7, E=11... (prime numbers in order), what is 'CAT' coded as?
Prime coding: C→5, A→2, T→71 → concatenated = 5271
prime, numbers, advanced

Question 15

If each letter is coded as its ASCII value (A=65, B=66...), what is 'BUG' coded as?
ASCII coding: B=66, U=85, G=71 → concatenated = 668571
ascii, computer

Question 16

If A=1, B=1, C=2, D=3, E=5, F=8... (Fibonacci sequence), what is 'BED' coded as?
Fibonacci coding: B=1, E=5, D=3 → concatenated = 153
fibonacci, sequence, advanced

Question 17

If vowels (A,E,I,O,U) are coded as 'V' and consonants as 'C', what is the code for 'CAT'?
Vowel/Consonant coding: C→C, A→V, T→C → CVC
vowel, consonant, pattern

Question 18

If each letter is coded as its ASCII value (A=65, B=66...), what is 'BUG' coded as?
ASCII coding: B=66, U=85, G=71 → concatenated = 668571
ascii, computer

Question 19

If a word's code is the product of its letter positions, what is 'ACE's code?
Product calculation: A=1 × C=3 × E=5 = 15
product, arithmetic

Question 20

For 'DEF', odd positions (1st,3rd,5th...) are coded as their position numbers, even positions are shifted by 1 letter forward. What is the code?
Odd/Even coding: Pos1:D→4, Pos2:E→E, Pos3:F→6 → 4E6
position, pattern, mixed
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