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Coding-Decoding - Advanced Level: matrix coding ADVANCED

Boost your speed and accuracy with this high difficulty set 📈 worksheet. Worksheet 25 of 30 presents 20 advanced-level coding-decoding problems. Focus on matrix coding while practicing code breaking, pattern decoding, cipher solving. Difficulty: complex scenarios and multi-step problems. Perfect for advanced test takers.

📝 Worksheet 25 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Advanced level

What you'll learn in this worksheet:
Your progress through Coding-Decoding
Worksheet 25 of 30 (83% complete)

Question 1

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

Question 2

If 'BAG' = 10 and 'SUN' = 54, then 'PEN' = ?
Sum of letter positions: BAG = 2+1+7 = 10, SUN = 19+21+14 = 54, PEN = 16+5+14 = 35
position, sum

Question 3

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

Question 4

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

Question 5

If the code for 'ANALOG' is 'CPCNQI' using the rule 'each letter shifted forward by 2', then what is the original word for the code 'CPCNQI'?
To decode, shift each letter backward by 2: CPCNQI → ANALOG
decode, reverse

Question 6

If the code for 'BLACK' is 'EODFN' using the rule 'each letter shifted forward by 3', then what is the original word for the code 'EODFN'?
To decode, shift each letter backward by 3: EODFN → BLACK
decode, reverse

Question 7

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

Question 8

If 'LIP' = 37 and 'RAT' = 39, then 'BAG' = ?
Sum of letter positions: LIP = 12+9+16 = 37, RAT = 18+1+20 = 39, BAG = 2+1+7 = 10
position, sum

Question 9

If A=1, B=2, C=3... Z=26, then 'WORLD' is coded as?
Converting each letter to its position number: W=23, O=15, R=18, L=12, D=4 → 231518124
numbers, substitution

Question 10

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

Question 11

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

Question 12

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

Question 13

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

Question 14

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

Question 15

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 16

If 'KEY' = 41 and 'CUP' = 40, then 'DOG' = ?
Sum of letter positions: KEY = 11+5+25 = 41, CUP = 3+21+16 = 40, DOG = 4+15+7 = 26
position, sum

Question 17

If the code for 'FAST' is 'JEWX' using the rule 'each letter shifted forward by 4', then what is the original word for the code 'JEWX'?
To decode, shift each letter backward by 4: JEWX → FAST
decode, reverse

Question 18

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

Question 19

If A=1, B=2, C=3... Z=26, then 'WORLD' is coded as?
Converting each letter to its position number: W=23, O=15, R=18, L=12, D=4 → 231518124
numbers, substitution

Question 20

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