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Mensa IQ Numerical Reasoning and Arithmetic 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.

Read the first 7 Mensa IQ Numerical Reasoning and Arithmetic flashcards as text

  1. A sequence: 6, 11, 21, 41, 81, [?]

    Answer: 161

    Each term ≈ 2×previous − 1: 2×6−1=11, 2×11−1=21, 2×21−1=41, 2×41−1=81, 2×81−1=161.

  2. A missing-number table: Row 1: [2, 4, 8]. Row 2: [3, 9, 27]. Row 3: [4, 16, ?]. What fills the missing cell?

    Answer: 64

    Each row follows the pattern n, n², n³ for the base n in column 1; row 3 base=4, so column 3 = 4³ = 64.

  3. What percentage of 360 is 90?

    Answer: 25%

    90/360 × 100 = 25%.

  4. A sequence: 0.5, 1.5, 4.5, 13.5, [?]

    Answer: 40.5

    Each term is multiplied by 3; 13.5 × 3 = 40.5.

  5. Two numbers are in the ratio 3:4 and their product is 192. What is the larger number?

    Answer: 16

    Let numbers be 3k and 4k; product = 12k² = 192; k² = 16; k = 4; larger number = 4×4 = 16.

  6. A sequence of prime numbers: 2, 3, 5, 7, 11, 13, [?]

    Answer: 17

    The sequence lists consecutive prime numbers; the next prime after 13 is 17.

  7. A 3×3 grid has numbers such that each row, column, and diagonal equals 15 (a magic square). Given: top-left=6, top-center=1, top-right=8; middle-center=5; what is the bottom-right cell?

    Answer: 2

    In the classic Lo Shu magic square with magic constant 15, the bottom-right is 2 (full square: 6,1,8/7,5,3/2,9,4).