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Coding-Decoding - Beginner-Intermediate Level: conditional coding BEGINNER-INTERMEDIATE

Strategic fast track practice for coding-decoding: 20 beginner-intermediate-level problems. Worksheet 9 of 30 - Focus: conditional coding. Develop expertise in number coding, symbol substitution, code breaking with step-by-step solutions. Ideal for developing learners targeting building on fundamentals with moderate challenges.

📝 Worksheet 9 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Beginner-intermediate level

What you'll learn in this worksheet:
Your progress through Coding-Decoding
Worksheet 9 of 30 (30% complete)

Question 1

In a certain code, each vowel is replaced by the next letter (A→B, E→F, I→J, O→P, U→V). How is 'EXAM' coded?
Vowels shifted forward: EXAM → FXBM
conditional, vowels

Question 2

If 'SIGMA' is coded as 'ZNTRH' using the rule 'reverse the word, then replace each letter with its opposite', what is the code?
Step 1: Reverse SIGMA → AMGIS, Step 2: Opposite → ZNTRH
mixed, complex

Question 3

In a certain code, each consonant is replaced by the previous letter (B→A, C→B, etc.). How is 'INTERPRETER' coded?
Consonants shifted backward: INTERPRETER → IMSEQOQESEQ
conditional, vowels

Question 4

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

Question 5

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

Question 6

If 'MAP' is coded as 'NBQ', then how is 'BAT' coded?
The pattern is shifting each letter by +1. So BAT becomes: B(2→3) → A(1→2) → T(20→21) = CBU
shift, basic

Question 7

If 'BOX' = 41 and 'RAT' = 39, then 'HAT' = ?
Sum of letter positions: BOX = 2+15+24 = 41, RAT = 18+1+20 = 39, HAT = 8+1+20 = 29
position, sum

Question 8

If 'CIPHER' is coded as 'IVSKRX' using the rule 'replace each letter with its opposite (A↔Z, B↔Y), then reverse', what is the code?
Step 1: Opposite CIPHER → XRKSVI, Step 2: Reverse → IVSKRX
mixed, complex

Question 9

If 'FAN' = 21 and 'BAG' = 10, then 'BOX' = ?
Sum of letter positions: FAN = 6+1+14 = 21, BAG = 2+1+7 = 10, BOX = 2+15+24 = 41
position, sum

Question 10

If A=1, B=2, C=3... Z=26, then 'CODE' is coded as?
Converting each letter to its position number: C=3, O=15, D=4, E=5 → 31545
numbers, substitution

Question 11

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

Question 12

If the code for 'SIGMA' is 'S3GM1' 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 'S3GM1'?
To decode, replace numbers back to vowels: S3GM1 → SIGMA
decode, reverse

Question 13

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

Question 14

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

Question 15

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

Question 16

If the code for 'MAT' is 'M1T' 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 'M1T'?
To decode, replace numbers back to vowels: M1T → MAT
decode, reverse

Question 17

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

Question 18

If A=1, B=2, C=3... Z=26, then 'PYTHON' is coded as?
Converting each letter to its position number: P=16, Y=25, T=20, H=8, O=15, N=14 → 16252081514
numbers, substitution

Question 19

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

Question 20

If 'BUS' = 42 and 'BOX' = 41, then 'FAN' = ?
Sum of letter positions: BUS = 2+21+19 = 42, BOX = 2+15+24 = 41, FAN = 6+1+14 = 21
position, sum
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