I'mÊa teacher at a local Middle School and I would like the answers for the following questions. What is the greatest common factor for.. 546 and 780 156 and 732 285 and 399 168 and 300 2,103 and 9,945 204 and 306 170 and 272 40 and 109 483 and 759 324 and 432 1,492 and 1,924 Hi,The usual way to find the greatest common factor, GCF (sometimes called the greatest common divisor) is to first find prime factorization of the numbers. For your first pair, 546 and 780, 780 = 2^{2}x3x5x13 Likewise for 2,103 and 9,945 9945 = 3^{2}x5x13x17 If you know the Euclidean Algorithm you can use it to find the GCF's. By the Euclidean Algorithm: 780 and 546:
2,103 and 9,945:
Leeanne and Penny
