To find common factors, list all factors of each number, then pick the ones that appear in both lists.

• Factors of 12: 1, 2, 3, 4, 6, 12
• Factors of 32: 1, 2, 4, 8, 16, 32
• Common factors (in both lists): 1, 2, 4

Final Answer: 1, 2, 4