Question

find the lcm of 21 and 63 by prime factorization method​

Answer 1

1. The prime factorization of 21 is: 3 x 7.
2. The prime factorization of 63 is: 3 x 3 x 7.
3. Eliminate the duplicate factors of the two lists, then multiply them once with the remaining factors of the lists to get lcm(21,21) = 63