Common factors of 12 and 27 are: 1 and 3.
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The prime factors of 12 are 2 and 3. The only prime factor of 27 is 3. The prime number that both 12 and 27 have as a factor is 3.
' 1 ' is their only common factor.
The common factor of both 15 and 27 is 3.
The greatest common factor is the highest number that divides exactly into two or more numbers. 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 108: 1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, 108 The greatest common factor for 48 and 108 is 12.
The only common factor of 14 and 27 (number that cango into both of them evenly) is ' 1 '.