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What is the greatest common factor of 12 and 10______ The least common multiple is______ The greatest common factor of. 17 and 51 is______ The least common multiple is______ What is the greatest common factor of. 15 and 8______ The least common multiple is______ ．
12 = 2 × 2 × 310 = 2 × 5, so the greatest common factor of 12 and 10 is 2 and the least common multiple is 2 × 2 × 3 × 5 = 60; 51 = 17 × 3, so the greatest common factor of 17 and 51 is 17 and the least common multiple is 51; 15 and 8 are coprime, so the greatest common factor of 15 and 8 is 1 and the least common multiple is 15 × 8 = 120
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