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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 code, APPLE → BQQMF (each letter +1). What is GRAPE coded as?

    Answer: HSBQF

    G+1=H, R+1=S, A+1=B, P+1=Q, E+1=F → HSBQF.

  2. RACECAR backwards is RACECAR. Which code technique produces the same output for this word?

    Answer: Reversing the word

    RACECAR is a palindrome; the only listed technique that preserves it is reversing — palindromes read the same forward and backward.

  3. If word 'sun' = 19-21-14 and 'moon' = 13-15-15-14, what word is 19-20-1-18?

    Answer: STAR

    S=19, T=20, A=1, R=18 → STAR.

  4. In a shift code, LEMON = OHPRQ. What is the shift?

    Answer: +3

    L+3=O, E+3=H, M+3=P, O+3=R, N+3=Q — each letter advances 3 positions.

  5. Using the code A=1, B=2, C=3, …, Z=26, what is the sum of the codes for 'ACE'?

    Answer: 9

    A=1, C=3, E=5; 1+3+5=9.

  6. A code swaps vowels in sequence: A→E, E→I, I→O, O→U, U→A. What does BASIC code to?

    Answer: BESOC

    B stays, A→E, S stays, I→O, C stays → BESOC.

  7. In a letter-number-letter pattern: B2D means 'skip 2 letters after B to get D'. What does G3K represent?

    Answer: Skip 3 letters after G to reach K

    G, skip H-I-J (3 letters), land on K — the number indicates how many letters to skip.