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12と18の最大公約数は？
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Common divisors divide both numbers evenly.
Example: 12 and 18 are both divisible by 6, so 6 is a common divisor.
The GCD is the biggest common divisor.
Example: the common divisors of 12 and 18 are 1, 2, 3, and 6, so the GCD is 6.
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