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1, 3,9 Factors of 15 List of positive integer factors of 15 that divides 15 without a remainder 1, 3,5,15 Greatest Common Factor We found the factors and prime factorization of 9 and 15 The biggest common factor number is the GCF number So the greatest common factor 9 and 15 is 3 Also check out the Least Common Multiple of 9 and 15Least Common Multiple (LCM) of 15 and 21 with Primes Least common multiple can be found by multiplying the highest exponent prime factors of 15 and 21 First we will calculate the prime factors of 15 and 21 Prime Factorization of 1515 The instructions to find the LCM of 3, 9 and 15 are the next 1 Decompose all numbers into prime factors 2 Write all numbers as the product of its prime factors 3 Choose the common and uncommon prime factors with the greatest exponent 4 4 9 Least Common Multiple 21 9 15 lcm