1,3
1,3,9
1,2,3,4,6,12
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the greatest common factor of 6,12, and 15 is 3.
1, 2, 3, and 6 are all common factors of 6 and 12
The GCF is 3.
Since 12 is a factor of 72, all of its factors are common.
The greatest common factor (GCF) of 12, 6, and 9 is the largest number that divides each of the numbers without leaving a remainder. To find the GCF, you can first list the factors of each number: 12 (1, 2, 3, 4, 6, 12), 6 (1, 2, 3, 6), and 9 (1, 3, 9). The largest number that appears in all three lists is the GCF, which in this case is 3. Therefore, the GCF of 12, 6, and 9 is 3.