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To find out the GCF of two numbers, you first split them into their prime factors:

57 = 3x19

27 = 3x3x3

The next step is to identify any common factors. In this case, both numbers have a single 3 as a prime factor. Thus, the greatest common factor of 57 and 27 is 3.

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Q: What is the GCF of 57 and 27 worked out?
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