What is the GCF for 54, 72?
3 Answers
Greatest Common Factor is
Explanation:
Factors of
Factors of
Hence common factors are
and Greatest Common Factor is
The GCF of
Explanation:
One way of finding the GCF of two numbers goes as follows:

Divide the larger number by the smaller to give a quotient and remainder.

If the remainder is
#0# then the smaller number is the GCF. 
Otherwise repeat with the smaller number and the remainder.
In our example, we find:
#72/54 = 1# with remainder#18#
#54/18 = 3# with remainder#0#
So the GCF is
18
Explanation:
Find the prime factors of each number and see how many factors are shared by both numbers.
GCF=