It is: 6
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The LCM is 36. Other common multiples include 72 and 108.
The common factors of 6 and 27 are 1 and 3.
Find the factors of each number first. For 3 it is 1, 3 For 6 it is 1, 2, 3, 6 The greatest common factor of 3 and 6 is 3 since that is the highest factor they have in common.
2 and 6. The greatest common factor is 6.
Since 6 is a factor of 60, they have in common all of the factors of 6: 1, 2, 3 & 6.