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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. What is the next number in the sequence: 2, 4, 8, 16, 32, [?]?

    Answer: 64

    Each term is multiplied by 2 (geometric sequence with ratio 2), so 32 × 2 = 64.

  2. Find the missing number: 3, 7, 13, 21, 31, [?]

    Answer: 43

    The differences between terms are 4, 6, 8, 10, 12 — increasing by 2 each time; 31 + 12 = 43.

  3. A number grid: the value in each cell equals the product of its row number and column number. In a 4×4 grid, what is the sum of all numbers in row 4?

    Answer: 40

    Row 4 values are 4×1, 4×2, 4×3, 4×4 = 4, 8, 12, 16; sum = 40.

  4. If a train travels at 90 km/h for 40 minutes and then 60 km/h for 20 minutes, what total distance does it cover?

    Answer: 80 km

    90 × (40/60) = 60 km for the first leg; 60 × (20/60) = 20 km for the second leg; total = 80 km.

  5. What number should replace the question mark? 5 : 25 :: 7 : [?]

    Answer: 49

    The relationship is x : x² (squaring); 7² = 49.

  6. The average of five numbers is 18. Four of the numbers are 12, 15, 20, and 24. What is the fifth number?

    Answer: 19

    Total sum = 5 × 18 = 90; known sum = 12+15+20+24 = 71; fifth number = 90 − 71 = 19.

  7. What is the next number in the sequence: 1, 1, 2, 3, 5, 8, 13, [?]?

    Answer: 21

    This is the Fibonacci sequence; each term is the sum of the two preceding terms: 8 + 13 = 21.