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Number-Letter Codes - Intermediate Level: difference codes INTERMEDIATE

Level up your number-letter codes skills with this comprehensive review. 20 intermediate-level problems await in Worksheet 14 of 30. Focus area: difference codes. Learn alphabet numbering, code conversion, dual coding through systematic practice. Designed for mid-level learners seeking moderate complexity with mixed patterns.

📝 Worksheet 14 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Intermediate level

What you'll learn in this worksheet:
Your progress through Number-Letter Codes
Worksheet 14 of 30 (46% complete)

Question 1

If letters are coded as (position mod 9), 'ALPHABET' becomes?
Modular coding: A=1%9=1, L=12%9=3, P=16%9=7, H=8%9=8, A=1%9=1, B=2%9=2, E=5%9=5, T=20%9=2 → concatenated = 13781252
modular, advanced

Question 2

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 3

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 4

If letters are coded as (position mod 5), 'PYTHON' becomes?
Modular coding: P=16%5=1, Y=25%5=0, T=20%5=0, H=8%5=3, O=15%5=0, N=14%5=4 → concatenated = 100304
modular, advanced

Question 5

For 'EGG', odd positions use position coding, even positions use reverse coding. What is the result?
Alternating coding: E→5(pos), G→20(rev), G→7(pos) → 5207
alternating, mixed, advanced

Question 6

If each letter is coded as its ASCII value (A=65, B=66...), what is 'DOG' coded as?
ASCII coding: D=68, O=79, G=71 → concatenated = 687971
ascii, computer

Question 7

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 8

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

Question 9

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 10

If each letter is shifted forward by 1 positions (A→B), what is 'CAT' coded as?
Shift coding: C→D(+1), A→B(+1), T→U(+1) → DBU
shift, caesar, cipher

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 'EGG' coded as?
Digit sum coding: E=5→digit_sum=5, G=7→digit_sum=7, G=7→digit_sum=7 → concatenated = 577
digits, sum, pattern

Question 12

If letters are coded as (position mod 9), 'LETTER' becomes?
Modular coding: L=12%9=3, E=5%9=5, T=20%9=2, T=20%9=2, E=5%9=5, R=18%9=0 → concatenated = 352250
modular, advanced

Question 13

If letters are coded as (position mod 7), 'HELLO' becomes?
Modular coding: H=8%7=1, E=5%7=5, L=12%7=5, L=12%7=5, O=15%7=1 → concatenated = 15551
modular, advanced

Question 14

If each letter is coded as the square of its position (A=1→1, B=2→4, C=3→9...), what is 'DOG' coded as?
Square coding: D=4²=16, O=15²=225, G=7²=49 → concatenated = 1622549
square, exponential, advanced

Question 15

If a word's code is the product of its letter positions, what is 'FISH's code?
Product calculation: F=6 × I=9 × S=19 × H=8 = 8208
product, arithmetic

Question 16

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 17

If a word's code is the sum of its letter positions (A=1,B=2...), what is 'CAT's code?
Sum calculation: C=3 + A=1 + T=20 = 24
sum, arithmetic

Question 18

If a word's code is the sum of its letter positions (A=1,B=2...), what is 'LION's code?
Sum calculation: L=12 + I=9 + O=15 + N=14 = 50
sum, arithmetic

Question 19

If A=26, B=25, C=24... Z=1 (reverse order), then 'PIG' is coded as?
Reverse coding: P=11 + I=18 + G=20 → concatenated = 111820
reverse, sequence

Question 20

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
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