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Number-Letter Codes - Beginner-Intermediate Level: dual coding BEGINNER-INTERMEDIATE

Strategic fast track practice for number-letter codes: 20 beginner-intermediate-level problems. Worksheet 9 of 30 - Focus: dual coding. Develop expertise in letter-number mapping, positional codes, ASCII patterns with step-by-step solutions. Ideal for developing learners targeting building on fundamentals with moderate challenges.

📝 Worksheet 9 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Beginner-intermediate level

What you'll learn in this worksheet:
Your progress through Number-Letter Codes
Worksheet 9 of 30 (30% complete)

Question 1

For 'ABC', find the differences between consecutive letter positions (A=1,B=2...). Format as comma-separated values.
Positions: [1, 2, 3] → Differences: [1, 1]
difference, sequence, pattern

Question 2

For 'JKL', 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:J→10, Pos2:K→K, Pos3:L→12 → 10K12
position, pattern, mixed

Question 3

For 'JKL', 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:J→10, Pos2:K→K, Pos3:L→12 → 10K12
position, pattern, mixed

Question 4

If each letter is coded as the sum of digits of its position (A=1→1, B=2→2, ..., J=10→1+0=1...), what is 'BED' coded as?
Digit sum coding: B=2→digit_sum=2, E=5→digit_sum=5, D=4→digit_sum=4 → concatenated = 254
digits, sum, pattern

Question 5

If each letter is shifted forward by 5 positions (A→F), what is 'BOOK' coded as?
Shift coding: B→G(+5), O→T(+5), O→T(+5), K→P(+5) → GTTP
shift, caesar, cipher

Question 6

For 'CAT', odd positions use position coding, even positions use position coding. What is the result?
Alternating coding: C→3(pos), A→1(pos), T→20(pos) → 3120
alternating, mixed, advanced

Question 7

If each letter is coded as the square of its position (A=1→1, B=2→4, C=3→9...), what is 'CAT' coded as?
Square coding: C=3²=9, A=1²=1, T=20²=400 → concatenated = 91400
square, exponential, advanced

Question 8

If A=26, B=25, C=24... Z=1 (reverse order), then 'DOG' is coded as?
Reverse coding: D=23 + O=12 + G=20 → concatenated = 231220
reverse, sequence

Question 9

If A=1, B=2, C=3... Z=26, then 'EGG' is coded as?
Letter to number: E=5 + G=7 + G=7 → concatenated = 577
basic, sequence

Question 10

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 11

If each letter is coded as the sum of digits of its position (A=1→1, B=2→2, ..., J=10→1+0=1...), what is 'BED' coded as?
Digit sum coding: B=2→digit_sum=2, E=5→digit_sum=5, D=4→digit_sum=4 → concatenated = 254
digits, sum, pattern

Question 12

If a word's code is the sum of its letter positions (A=1,B=2...), what is 'FISH's code?
Sum calculation: F=6 + I=9 + S=19 + H=8 = 42
sum, arithmetic

Question 13

For 'STU', 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:S→19, Pos2:T→T, Pos3:U→21 → 19T21
position, pattern, mixed

Question 14

If a word's code is the sum of its letter positions (A=1,B=2...), what is 'FISH's code?
Sum calculation: F=6 + I=9 + S=19 + H=8 = 42
sum, arithmetic

Question 15

For 'ACE', find the differences between consecutive letter positions (A=1,B=2...). Format as comma-separated values.
Positions: [1, 3, 5] → Differences: [2, 2]
difference, sequence, pattern

Question 16

For 'ABC', find the differences between consecutive letter positions (A=1,B=2...). Format as comma-separated values.
Positions: [1, 2, 3] → Differences: [1, 1]
difference, sequence, pattern

Question 17

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 18

If each letter is shifted forward by 2 positions (A→C), what is 'CAR' coded as?
Shift coding: C→E(+2), A→C(+2), R→T(+2) → ECT
shift, caesar, cipher

Question 19

If A=1, B=1, C=2, D=3, E=5, F=8... (Fibonacci sequence), what is 'DOG' coded as?
Fibonacci coding: D=3, O=610, G=13 → concatenated = 361013
fibonacci, sequence, advanced

Question 20

If each letter is coded as the square of its position (A=1→1, B=2→4, C=3→9...), what is 'ACE' coded as?
Square coding: A=1²=1, C=3²=9, E=5²=25 → concatenated = 1925
square, exponential, advanced
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