Well, honey, the greatest common factor (GCF) of 12, 36, and 28 is 4. That's the largest number that can divide all three of those numbers without leaving a remainder. So, there you have it, 4 is the magic number in this case.
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GCF(12, 28, 36) = 4, LCM(12, 28, 36) = 252.
Four is the GCF of 12, 28 and 36
The greatest common factor (gcf) of 28 and 36 is 9.
The GCF is: 12.
The GCF of 28, 36 and 52 is 4.