ReasoningAbility.com

Coding-Decoding - Intermediate Level: number coding INTERMEDIATE

Quick mental agility ★ session: 20 intermediate-level coding-decoding questions. Worksheet 17 of 30 - Focus: number coding. Practice symbol substitution, code breaking, pattern decoding with instant feedback. Great for mid-level students needing moderate complexity with mixed patterns practice.

📝 Worksheet 17 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Intermediate level

What you'll learn in this worksheet:
Your progress through Coding-Decoding
Worksheet 17 of 30 (56% complete)

Question 1

If 'MAP' is coded as 'PDS', then how is 'HAT' coded?
The pattern is shifting each letter by +3. So HAT becomes: H(8→11) → A(1→4) → T(20→23) = KDW
shift, basic

Question 2

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

Question 3

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 4

If 'RAT' = 39 and 'SUN' = 54, then 'CUP' = ?
Sum of letter positions: RAT = 18+1+20 = 39, SUN = 19+21+14 = 54, CUP = 3+21+16 = 40
position, sum

Question 5

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 6

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 7

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

Question 8

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

Question 9

If 'CAR' = 22 and 'PEN' = 35, then 'BAG' = ?
Sum of letter positions: CAR = 3+1+18 = 22, PEN = 16+5+14 = 35, BAG = 2+1+7 = 10
position, sum

Question 10

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

Question 11

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 12

If A=1, B=2, C=3... Z=26, then 'EXAM' is coded as?
Converting each letter to its position number: E=5, X=24, A=1, M=13 → 524113
numbers, substitution

Question 13

If 'KEY' is coded as 'PJD', then how is 'BOX' coded?
The pattern is shifting each letter by +5. So BOX becomes: B(2→7) → O(15→20) → X(24→3) = GTC
shift, basic

Question 14

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

Question 15

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

Question 16

If 'MATHS' is coded as 'MCHXE' using the rule 'multiply each letter's position by 3' (A=1, B=2, ..., Z=26, wrap around), then how is 'HAT' coded?
Each letter position ×3: MATHS → MCHXE
arithmetic, operations

Question 17

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

Question 18

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

Question 19

If the code for 'CUP' is 'HZU' using the rule 'each letter shifted forward by 5', then what is the original word for the code 'HZU'?
To decode, shift each letter backward by 5: HZU → CUP
decode, reverse

Question 20

If 'EXAM' is coded as '43' using the rule 'sum of the positions of all letters', then how is 'ANALOG' coded?
Sum of positions: EXAM → 43
arithmetic, operations
Previous Worksheet Next Worksheet