It's affinity!! You can go on forever and not finish doing the multiples.
Multiples of 4 are 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52... Multiples of 13 are 13, 26, 39, 52, 65, 78, 91, 104... Common multiples of 4 and 13 are 52, 104, 156...
Any multiple of 52.
13
52, 104, 156 and so on.
No, none of them.
Multiply 4 times 13 then use it multiples. 52, 104, 156...
52, 104, 156
Infinitely many.
4368 and its multiples.
There are 13 two-digit multiples of 7.
13 is a prime number, which means the only multiple of the number is 1.
No. They have many multiples in common, but not all. For example, 52 is a multiple of 4, but not a multiple of 8.