What is the greatest common factor of 12x and 18?
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Correct!
Not quite. The correct answer is highlighted.
Correct answer to question 64 (Mathematics Knowledge): 6
Method
The factors of 12 are 1, 2, 3, 4, 6, 12 and those of 18 are 1, 2, 3, 6, 9, 18, so the greatest they share is 6. The choice 36 is the least common multiple instead.
Updated: November 2026
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