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Mensa IQ Odd One Out Puzzles Flashcards

6 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 6 Mensa IQ Odd One Out Puzzles flashcards as text

  1. Which number is the odd one out: 2, 4, 6, 8, 9, 10?

    Answer: 9

    All numbers except 9 are even (divisible by 2). 9 is the only odd number in the set, as 9 ÷ 2 = 4.5, which is not a whole number.

  2. Which does NOT belong: addition, subtraction, multiplication, equation, division?

    Answer: Equation

    Addition, subtraction, multiplication, and division are the four basic arithmetic operations. An equation is a mathematical statement, not an operation — it expresses equality between two expressions.

  3. Which number does NOT fit: 11, 22, 33, 44, 56, 66?

    Answer: 56

    11, 22, 33, 44, and 66 are all multiples of 11 with repeated digits. 56 is not a multiple of 11 (56 ÷ 11 = 5.09) and doesn't have repeated digits.

  4. Which shape is the odd one out: cube, sphere, cylinder, pyramid, rectangle?

    Answer: Rectangle

    Cube, sphere, cylinder, and pyramid are all three-dimensional objects (solids). A rectangle is a two-dimensional shape (a flat figure), making it categorically different.

  5. Which number does NOT belong: 1, 8, 27, 64, 100, 125, 216?

    Answer: 100

    All others are perfect cubes: 1³, 2³, 3³, 4³, 5³, 6³. But 100 is not a perfect cube — it's 10², a perfect square. The cube root of 100 is approximately 4.64.

  6. Which letter does NOT belong: A, E, I, O, B?

    Answer: B

    A, E, I, and O are vowels in the English alphabet. B is a consonant, making it the odd one out in this group of letters.