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Mensa IQ Sequence Completion 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. What comes next in the sequence: 2, 3, 5, 7, 11, 13, ___?

    Answer: 17

    These are consecutive prime numbers, and the next prime after 13 is 17.

  2. Find the next term: 5, 10, 20, 40, 80, ___?

    Answer: 160

    Each term is multiplied by 2, so 80 × 2 = 160.

  3. Complete the sequence: 3, 8, 15, 24, 35, ___?

    Answer: 48

    The pattern is n² − 1 (3=2²−1, 8=3²−1, …), so the next is 7²−1 = 48.

  4. What is the next letter group: AB, DE, GH, JK, ___?

    Answer: MN

    Each pair skips one letter of the alphabet (AB, skip C, DE, skip F, GH, skip I, JK, skip L, MN).

  5. Find the missing value: 2, 6, 18, 54, ___?

    Answer: 162

    Each term is multiplied by 3, so 54 × 3 = 162.

  6. What comes next: 1, 8, 27, 64, 125, ___?

    Answer: 216

    These are perfect cubes (1³, 2³, 3³, 4³, 5³), so the next is 6³ = 216.

  7. What is the next number: 4, 7, 13, 25, 49, ___?

    Answer: 97

    Each term is approximately doubled then decreased by 1 (4→7: ×2−1, 7→13: ×2−1, 13→25: ×2−1, 25→49: ×2−1, so 49×2−1=97).