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Ascertain the prime factors of both numbers :-

660 = 2 x 2 x 3 x 5 x 11

1155 = 3 x 5 x 7 x 11

The only factors (other than 1) that both numbers have in common are 3, 5 and 11.

The greatest common factor is therefore 3 x 5 x 11 = 165

165 is the GCF of 660 and 1155

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14y ago

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More answers

The GCF is 165.

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Wiki User

12y ago
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It is 5

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8y ago
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Q: What is the greatest common factor 660 and 1155?
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