To find the greatest common factor (GCF) of 56 and 91, you can use the prime factorization method or the Euclidean algorithm. Here, I'll use the prime factorization method.
Step 1: Find the prime factors of 56 and 91.
Prime factors of 56:
56 = 2 * 28
= 2 * 2 * 14
= 2 * 2 * 2 * 7
Prime factors of 91:
91 = 7 * 13
Step 2: Identify the common prime factors and their lowest exponents in both numbers.
The common prime factor is 7.
Step 3: Multiply the common prime factors.
GCF(56, 91) = 7
So, the greatest common factor of 56 and 91 is 7.