2
28
The GCF is 11.
The GCF is 6.
The GCF is 2.
GCF(54, 56) = 2.
Least Common Multiple (LCM) for 72 108 is 216.
23 is a prime number, 36 is not a multiple of 23 so the HCF is 1.
The gcf is 3
45
The GCF is 15.
The greatest common factor of 42 and 45 is 3.Method 1: Listing Factors List all the factors of both numbers and the highest factor that is the same is the greatest common factor.Factors of 42: 1, 2, 3, 6, 7, 14, 21Factors of 45: 1, 3, 5, 9, 15The greatest common factor is 3.Method 2: Prime FactorizationFind the prime factorization of each number. The prime numbers that the numbers all share multiply to the great common factor.42=2*3*745=3*3*542 and 45 share one 3. Therefore, the greatest common factor is 3.