What is the greatest common factor of 56 84 and 140?
To find the greatest common factor (GCF) of 56, 84, and 140, we first need to factor each number. The prime factorization of 56 is 2^3 * 7, 84 is 2^2 * 3 * 7, and 140 is 2^2 * 5 * 7. To find the GCF, we look for the highest power of each prime factor that appears in all three factorizations, which in this case is 2^2 * 7, resulting in a GCF of 28.