what is the gcf of 28 and 36

The GCF of 28 and 36 is 4. One way to find the GCF is to compare the prime factorization of each number. The prime factorization of 28 is 2 x 2 x 7, and the prime factorization of 36 is 2 x 2 x 3 x 3. The common prime factors are 2 x 2, which equals 4. Therefore, the GCF of 28 and 36 is 4.