21 - 1, 3, 7, 21
51 - 1, 3, 17 ,51
the GCF is 3
Chat with our AI personalities
What is the greatest common factor shared by 51 and 21?
The GCF is 3.
The factors of the two numbers are :- 51 : 1, 3, 17 and 51 21 : 1, 3, 7 and 21. Ignoring the trivial factor of 1, the only common factor and therefore the greatest common factor is 3.
3 is the greatest common factor of 21, 27, and 51The GCF is 3.
The greatest common factor is 51