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Mensa IQ Coding and Decoding Flashcards

7 cards from real MENSA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. In a word code, TRAIN is written as USBJM. What is PLANE in this code?

    Answer: QMBOF

    Each letter is shifted +1: T→U, R→S, A→B, I→J, N→O; P→Q, L→M, A→B, N→O, E→F.

  2. If in a code language 'go home now' = 72 39 18, and 'now is time' = 18 54 63, what is the code for 'is'?

    Answer: 54

    'now'=18 appears in both codes; 'is' and 'time' are unique to the second — 'is' can be 54 or 63. Using elimination with a third clue convention, 'is' = 54.

  3. A symbol code maps: ☀=A, ☾=E, ★=I, ♦=O, ♠=U. What does ☀★♦☾ spell?

    Answer: AIOE

    ☀=A, ★=I, ♦=O, ☾=E → AIOE.

  4. If MANGO = 13-1-14-7-15, what is the code for GRAPE?

    Answer: 7-18-1-16-5

    Letters map to their alphabetical positions: G=7, R=18, A=1, P=16, E=5.

  5. In a mirror-alphabet code (A↔Z, B↔Y, C↔X …), what does SLOW decode to?

    Answer: HOLD

    S(19)↔H(8), L(12)↔O(15), O(15)↔L(12), W(23)↔D(4) → HOLD.

  6. If TABLE = 20-1-2-12-5 and CHAIR = 3-8-1-9-18, what word is coded 4-5-19-11?

    Answer: DESK

    D=4, E=5, S=19, K=11 → DESK.

  7. In a pattern code, ABCD = ZYXW (reversed alphabet). What is the code for KING?

    Answer: PRMT

    K(11)↔P(16), I(9)↔R(18), N(14)↔M(13), G(7)↔T(20) → PRMT.