Hello!
The least common factor of 27 and 21 is 189.
Explanation: You had to find the prime factorization of 27. It gave us 3*3*3=27, then you can also to find the prime factorization of 21. And it gave us 3*7=21, then multiply by the each factor of the greater number of times it occurs in step 1 or step 2. And it gave us 7*3*3*3=189 is the right answer. Hope this helps! And thank you for posting at here on Brainly. And have a great day! -Charlie
