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Coding-Decoding - Expert Level: operation coding EXPERT

Strategic basic drills ★ for coding-decoding: 20 expert-level problems. Worksheet 29 of 30 - Focus: operation coding. Develop expertise in letter coding, number coding, symbol substitution 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 Coding-Decoding
Worksheet 29 of 30 (96% complete)

Question 1

If the code for 'STUDY' is 'HGFWB' using the rule 'each letter replaced by its opposite (A↔Z, B↔Y)', then what is the original word for the code 'HGFWB'?
To decode, apply opposite again: HGFWB → STUDY
decode, reverse

Question 2

If the code for 'ALGORITHM' is '1LG4R3THM' using the rule 'vowels replaced by numbers (A=1,E=2,I=3,O=4,U=5)', then what is the original word for the code '1LG4R3THM'?
To decode, replace numbers back to vowels: 1LG4R3THM → ALGORITHM
decode, reverse

Question 3

If in a code, A↔Z, B↔Y, C↔X, etc. (each letter replaced by its opposite), then 'AUTHORIZE' becomes 'ZFGSLIRAV'. How is 'PROBLEM' coded?
Opposite of PROBLEM: PROBLEM → KILYOVN
opposite, mirror

Question 4

If 'NUMBER' is coded as 'PWODGT' using the rule 'add 2 to each letter's position' (A=1, B=2, ..., Z=26, wrap around), then how is 'FIRE' coded?
Each letter position +2: NUMBER → PWODGT
arithmetic, operations

Question 5

If 'BUS' is coded as 'GZX', then how is 'SUN' coded?
The pattern is shifting each letter by +5. So SUN becomes: S(19→24) → U(21→26) → N(14→19) = XZS
shift, basic

Question 6

If in a code, A↔Z, B↔Y, C↔X, etc. (each letter replaced by its opposite), then 'BAG' becomes 'YZT'. How is 'FILE' coded?
Opposite of FILE: FILE → UROV
opposite, mirror

Question 7

If 'LIGHT' is coded as 'THGIL', then how is 'WALL' coded?
The pattern is reverse coding: LIGHT → THGIL, so WALL → LLAW
reverse, pattern

Question 8

If A=1, B=2, C=3... Z=26, then 'HELLO' is coded as?
Converting each letter to its position number: H=8, E=5, L=12, L=12, O=15 → 85121215
numbers, substitution

Question 9

In a certain code, vowels become next consonant, consonants become next vowel. How is 'PATTERN' coded?
Swapping vowel/consonant roles: PATTERN → UBUUFUO
conditional, vowels

Question 10

If 'BUS' = 42 and 'HAT' = 29, then 'BAG' = ?
Sum of letter positions: BUS = 2+21+19 = 42, HAT = 8+1+20 = 29, BAG = 2+1+7 = 10
position, sum

Question 11

If the code for 'PEN' is 'NEP' using the rule 'reverse the word', then what is the original word for the code 'NEP'?
To decode, reverse the word: NEP → PEN
decode, reverse

Question 12

If A=1, B=2, C=3... Z=26, then 'LOGIC' is coded as?
Converting each letter to its position number: L=12, O=15, G=7, I=9, C=3 → 1215793
numbers, substitution

Question 13

If the code for 'PROTOCOL' is 'PR4T4C4L' using the rule 'vowels replaced by numbers (A=1,E=2,I=3,O=4,U=5)', then what is the original word for the code 'PR4T4C4L'?
To decode, replace numbers back to vowels: PR4T4C4L → PROTOCOL
decode, reverse

Question 14

If A=1, B=2, C=3... Z=26, then 'TEST' is coded as?
Converting each letter to its position number: T=20, E=5, S=19, T=20 → 2051920
numbers, substitution

Question 15

If in a code, A↔Z, B↔Y, C↔X, etc. (each letter replaced by its opposite), then 'MOON' becomes 'NLLM'. How is 'CAR' coded?
Opposite of CAR: CAR → XZI
opposite, mirror

Question 16

If 'LIGHT' is coded as 'THGIL', then how is 'FLOOR' coded?
The pattern is reverse coding: LIGHT → THGIL, so FLOOR → ROOLF
reverse, pattern

Question 17

If 'CAT' = 24 and 'BAG' = 10, then 'HAT' = ?
Sum of letter positions: CAT = 3+1+20 = 24, BAG = 2+1+7 = 10, HAT = 8+1+20 = 29
position, sum

Question 18

If 'CUP' is coded as 'PUC', then how is 'DOOR' coded?
The pattern is reverse coding: CUP → PUC, so DOOR → ROOD
reverse, pattern

Question 19

If 'MUSIC' is coded as 'CISUM', then how is 'CEILING' coded?
The pattern is reverse coding: MUSIC → CISUM, so CEILING → GNILIEC
reverse, pattern

Question 20

In a certain code, vowels are coded as A=1,E=2,I=3,O=4,U=5. How is 'LOGIC' coded?
Vowels: OI become numbers: L4G3C
conditional, vowels
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