I am a factor of 50 and a multiple of 5
Factors of 50: 1, 2, 5, 10, 25, 50Multiples of 5: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ...The numbers common are: 5, 10, 25, 50The numbers that are not common are: 1, 2