36 and 72
Factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36. The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. All of the factors of 36 are also factors of 72.
It is impossible to list all of the multiples of 36. That's an infinite list.
36=4x9=2x2x3x3, or, if you like, 36=6x6=2x3x2x3
Since 36 is a factor of 72, all of the factors of 36 are common to 72.
36, 72. That's it.
1,2,3,4,6,9,12,18 are the factors of 36.
Because all of them divide evenly into 36 with no remainder.
Since 36 is a factor of 72, all of its factors are included in the factors of 72.
36 and all multiples of 36 all multiples of 36 that do not end in 0 (72, 108, 144, etc.)
The composite factors of 36 are 4, 6, 9, 12, 18, 36
36, 72, 108 and keep adding 36 until you reach infinity.