1. Find the factors of 56:
56 = 1, 2, 4, 7, 8, 14, 28, 56
2. Find the factors of 42:
42 = 1, 2, 3, 6, 7, 14, 21, 42
3. Identify the common factors:
\text{Common factors of 56 and 42 are } 1, 2, 7, 14
4. Observe that 14 is a common factor:
14
Answer:
14