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Everything divides zero.
Zero divides nothing, because you can't divide by zero.
So 0 does not divide evenly into 12.
Because 4 is the largest number that will divide into both of those numbers evenly, with no remainder.
The GCF is 3.
13
The Least Common Multiple (LCM) is the smallest number that two or more numbers will divide into evenly and 12 is the smallest number that both 4 and 6 divide into evenly.
The greatest common factor, or GCF, is the largest positive integer that will divide evenly with no remainder into all the members of a given set of numbers.