Say we have listed the first few multiples of 4 and 5: the common multiples are those that are found in both lists: The multiples are those that are found in both lists: The multiples of 4 are: 4,8,12,16,20,24,28,32,36,40,44,.........The multiples of 5 are: 5,10,15,20,25,30,35,40,45,50,.... Hope this helped and if you need more help then just message me :)