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Coding-Decoding - Expert Level: complex coding EXPERT

Intensive progress check 🎯 drill: 20 expert-level coding-decoding questions. Worksheet 30 of 30 hones your complex coding abilities. Practice number coding, symbol substitution, code breaking under timed conditions. Best for expert-level students seeking challenging problems and time-bound practice.

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

What you'll learn in this worksheet:
Your progress through Coding-Decoding
Worksheet 30 of 30 (100% complete)

Question 1

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

Question 2

If 'BUS' is coded as 'GZX', then how is 'MAP' coded?
The pattern is shifting each letter by +5. So MAP becomes: M(13→18) → A(1→6) → P(16→21) = RFU
shift, basic

Question 3

If 'TEXT' is coded as 'UYFU' using the rule 'reverse the word, then shift each letter by +1', what is the code?
Step 1: Reverse TEXT → TXET, Step 2: Shift +1 → UYFU
mixed, complex

Question 4

If 'MEMORY' is coded as 'ATQOGO' using the rule 'reverse the word, then shift each letter by +2', what is the code?
Step 1: Reverse MEMORY → YROMEM, Step 2: Shift +2 → ATQOGO
mixed, complex

Question 5

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

Question 6

If 'CRYPTO' is coded as 'PUQZSD' using the rule 'shift each letter by +1, then reverse the word', what is the code?
Step 1: Shift +1 CRYPTO → DSZQUP, Step 2: Reverse → PUQZSD
mixed, complex

Question 7

If the code for 'LANGUAGE' is 'L1NG51G2' 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 'L1NG51G2'?
To decode, replace numbers back to vowels: L1NG51G2 → LANGUAGE
decode, reverse

Question 8

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

Question 9

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

Question 10

If 'CAT' = 24 and 'FAN' = 21, then 'SUN' = ?
Sum of letter positions: CAT = 3+1+20 = 24, FAN = 6+1+14 = 21, SUN = 19+21+14 = 54
position, sum

Question 11

If 'FUNCTION' is coded as 'IXQFWLRQ' using the rule 'shift each letter by +1, then shift again by +2', what is the code?
Step 1: Shift +1 FUNCTION → GVODUJPO, Step 2: Shift +2 → IXQFWLRQ
mixed, complex

Question 12

If 'MATH' is coded as 'JVCO' using the rule 'reverse the word, then shift each letter by +2', what is the code?
Step 1: Reverse MATH → HTAM, Step 2: Shift +2 → JVCO
mixed, complex

Question 13

If 'PEN' is coded as 'NEP', then how is 'HOUSE' coded?
The pattern is reverse coding: PEN → NEP, so HOUSE → ESUOH
reverse, pattern

Question 14

If 'BAT' is coded as 'FEX', then how is 'MOON' coded?
The pattern is shifting each letter by +4. So MOON becomes: M(13→17) → O(15→19) → O(15→19) → N(14→18) = QSSR
shift, basic

Question 15

If 'DOG' is coded as 'EPH', then how is 'BUS' coded?
The pattern is shifting each letter by +1. So BUS becomes: B(2→3) → U(21→22) → S(19→20) = CVT
shift, basic

Question 16

If 'RAT' is coded as 'UDW', then how is 'MOON' coded?
The pattern is shifting each letter by +3. So MOON becomes: M(13→16) → O(15→18) → O(15→18) → N(14→17) = PRRQ
shift, basic

Question 17

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

Question 18

If 'SUN' = 54 and 'DOG' = 26, then 'FAN' = ?
Sum of letter positions: SUN = 19+21+14 = 54, DOG = 4+15+7 = 26, FAN = 6+1+14 = 21
position, sum

Question 19

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 20

If A=1, B=2, C=3... Z=26, then 'BRAIN' is coded as?
Converting each letter to its position number: B=2, R=18, A=1, I=9, N=14 → 2181914
numbers, substitution
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