Find the lowest common multiple lcm of 9 and 21 July 8, 2019 16 32 64 128 Find the lowest common multiple of 21 9 and 15 lcm 21 9 15 Find the lowest common multiple of 21 9 and 15 text lcm ( 21 9 15 Find the least common multiple Find least common multiple using prime factorization Least common multiple and highest common factor