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To find the greatest common factor of two numbers you first need to express those numbers as prime factors:

34 = 17x2

68 = 17x2x2

The next step is to identify any common prime factors. In this case, both numbers have 17 and 2 as prime factors. Thus to find the GCF, we multiply these numbers together:

17x2 = 34.

Thus the greatest common factor of 34 and 68 is 34.

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13y ago

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