As a product of its prime factors: 3*5*5*5 = 375
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greatest common factor of 385 and 715 is 55.
5 x 7 x 11 = 385
11
A prime number has only 2 factors: 1 and itself. 385 has a 5 in the ones place, so 5 is also a factor. Since 5 X 77 = 385, 77 is a factor, too. There might be other factors. 385 is a composite number because it has more factors than 1 and itself.
The greatest common factor of 350 and 385 is 35.