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To find the greatest common factor of two numbers, you first need to break those numbers down into their prime factors. For 105 and 147 this is:

105 = 3x5x7

147 = 3x7x7

The next step is to identify any common prime factors. In this case, both numbers have a 3 as a prime factor, and a 7 as a prime factor. Multiply these together to get the GCF:

3x7 = 21

Thus the greatest common factor of 105 and 147 is 21.

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βˆ™ 2011-09-26 21:43:38
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Q: What is the greatest common factor of 105 and147?
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