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Number-Letter Codes - Expert Level: difference codes EXPERT

Strategic basic drills ★ for number-letter codes: 20 expert-level problems. Worksheet 29 of 30 - Focus: difference codes. Develop expertise in alphanumeric coding, letter-number mapping, positional codes with step-by-step solutions. Ideal for expert-level learners targeting challenging problems and time-bound practice.

📝 Worksheet 29 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Expert level

What you'll learn in this worksheet:
Your progress through Number-Letter Codes
Worksheet 29 of 30 (96% complete)

Question 1

If A=26, B=25, C=24... Z=1 (reverse order), then 'ANT' is coded as?
Reverse coding: A=26 + N=13 + T=7 → concatenated = 26137
reverse, sequence

Question 2

For 'MNO', 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:M→13, Pos2:N→N, Pos3:O→15 → 13N15
position, pattern, mixed

Question 3

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 4

If each letter is coded as its ASCII value (A=65, B=66...), what is 'BED' coded as?
ASCII coding: B=66, E=69, D=68 → concatenated = 666968
ascii, computer

Question 5

If A=2, B=3, C=5, D=7, E=11... (prime numbers in order), what is 'ABC' coded as?
Prime coding: A→2, B→3, C→5 → concatenated = 235
prime, numbers, advanced

Question 6

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 7

If A=2, B=3, C=5, D=7, E=11... (prime numbers in order), what is 'DOG' coded as?
Prime coding: D→7, O→47, G→17 → concatenated = 74717
prime, numbers, advanced

Question 8

If letters are coded as 5-bit binary (A=1=00001, B=2=00010...), 'FISH' is coded as?
Binary coding: F=6=00110, I=9=01001, S=19=10011, H=8=01000 → concatenated = 00110010011001101000
binary, advanced

Question 9

If each letter is coded as its ASCII value (A=65, B=66...), what is 'BED' coded as?
ASCII coding: B=66, E=69, D=68 → concatenated = 666968
ascii, computer

Question 10

If letters are coded as (position mod 10), 'PYTHON' becomes?
Modular coding: P=16%10=6, Y=25%10=5, T=20%10=0, H=8%10=8, O=15%10=5, N=14%10=4 → concatenated = 650854
modular, advanced

Question 11

If A=1, B=2, C=3... Z=26, then 'CAT' is coded as?
Letter to number: C=3 + A=1 + T=20 → concatenated = 3120
basic, sequence

Question 12

If A=1, B=2, C=3... Z=26, then 'WOLF' is coded as?
Letter to number: W=23 + O=15 + L=12 + F=6 → concatenated = 2315126
basic, sequence

Question 13

If letters are coded as 5-bit binary (A=1=00001, B=2=00010...), 'FROG' is coded as?
Binary coding: F=6=00110, R=18=10010, O=15=01111, G=7=00111 → concatenated = 00110100100111100111
binary, advanced

Question 14

If letters are coded as (position mod 7), 'CODING' becomes?
Modular coding: C=3%7=3, O=15%7=1, D=4%7=4, I=9%7=2, N=14%7=0, G=7%7=0 → concatenated = 314200
modular, advanced

Question 15

If each letter is shifted forward by 4 positions (A→E), what is 'BED' coded as?
Shift coding: B→F(+4), E→I(+4), D→H(+4) → FIH
shift, caesar, cipher

Question 16

For 'CAT', odd positions use reverse coding, even positions use reverse coding. What is the result?
Alternating coding: C→24(rev), A→26(rev), T→7(rev) → 24267
alternating, mixed, advanced

Question 17

If A=26, B=25, C=24... Z=1 (reverse order), then 'BOX' is coded as?
Reverse coding: B=25 + O=12 + X=3 → concatenated = 25123
reverse, sequence

Question 18

If each letter is shifted forward by 2 positions (A→C), what is 'BOOK' coded as?
Shift coding: B→D(+2), O→Q(+2), O→Q(+2), K→M(+2) → DQQM
shift, caesar, cipher

Question 19

If each letter is shifted forward by 3 positions (A→D), what is 'DOG' coded as?
Shift coding: D→G(+3), O→R(+3), G→J(+3) → GRJ
shift, caesar, cipher

Question 20

For 'XYZ', find the differences between consecutive letter positions (A=1,B=2...). Format as comma-separated values.
Positions: [24, 25, 26] → Differences: [1, 1]
difference, sequence, pattern
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