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Number-Letter Codes - Beginner Level: alphanumeric coding BEGINNER

This foundation builder 🌟 worksheet contains 20 beginner-level number-letter codes problems. Worksheet 1 of 30 focuses on alphanumeric coding. Practice alphanumeric coding, letter-number mapping, positional codes with our step-by-step solutions. Difficulty: foundational concepts and basic patterns. Recommended for entry-level learners.

📝 Worksheet 1 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Beginner level

What you'll learn in this worksheet:
Your progress through Number-Letter Codes
Worksheet 1 of 30 (3% complete)

Question 1

For 'DOG', odd positions use reverse coding, even positions use position coding. What is the result?
Alternating coding: D→23(rev), O→15(pos), G→20(rev) → 231520
alternating, mixed, advanced

Question 2

For 'DOG', odd positions use position coding, even positions use position coding. What is the result?
Alternating coding: D→4(pos), O→15(pos), G→7(pos) → 4157
alternating, mixed, advanced

Question 3

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 4

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 5

If A=1, B=2, C=3... Z=26, then 'BIRD' is coded as?
Letter to number: B=2 + I=9 + R=18 + D=4 → concatenated = 29184
basic, sequence

Question 6

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 7

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

Question 8

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 9

If a word's code is the sum of its letter positions (A=1,B=2...), what is 'WOLF's code?
Sum calculation: W=23 + O=15 + L=12 + F=6 = 56
sum, arithmetic

Question 10

For 'VWX', 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:V→22, Pos2:W→W, Pos3:X→24 → 22W24
position, pattern, mixed

Question 11

If a word's code is the sum of its letter positions (A=1,B=2...), what is 'DOG's code?
Sum calculation: D=4 + O=15 + G=7 = 26
sum, arithmetic

Question 12

If A=1, B=2, C=3... Z=26, then 'BIRD' is coded as?
Letter to number: B=2 + I=9 + R=18 + D=4 → concatenated = 29184
basic, sequence

Question 13

If A=1, B=1, C=2, D=3, E=5, F=8... (Fibonacci sequence), what is 'CAT' coded as?
Fibonacci coding: C=2, A=1, T=6765 → concatenated = 216765
fibonacci, sequence, advanced

Question 14

For 'VWX', 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:V→22, Pos2:W→W, Pos3:X→24 → 22W24
position, pattern, mixed

Question 15

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 16

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 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

For 'BDF', find the differences between consecutive letter positions (A=1,B=2...). Format as comma-separated values.
Positions: [2, 4, 6] → Differences: [2, 2]
difference, sequence, pattern

Question 19

If letters are coded as (position mod 5), 'HELLO' becomes?
Modular coding: H=8%5=3, E=5%5=0, L=12%5=2, L=12%5=2, O=15%5=0 → concatenated = 30220
modular, advanced

Question 20

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 'DOG' coded as?
Digit sum coding: D=4→digit_sum=4, O=15→digit_sum=6, G=7→digit_sum=7 → concatenated = 467
digits, sum, pattern
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