No. Numbers don't stop.
No, because the number of common multiples of any two nonzero numbers is infinite.
Yes! Another opinion: No, you could not, because there is no such thing. Whatever number you bring me, and tell me that it is the greatest common multiple of two numbers, then no matter how big your number is, all I have to do is multiply your number by the product of those two numbers, and I have a new, bigger, common multiple.
20 and 30 could be two such numbers.
it can be 60,10
The smallest of the two numbers could be 850.
Multiples of 6 are 6, 12, 18, 24, 30, 36... Multiples of 10 are 10, 20, 30, 40... The LCM of 6 and 10 is 30. The greatest common multiple could go into infinity.
I suppose the greatest common multiple could be considered as infinity. Once you calculate the least common multiple, you could keep doubling it forever. You could never determine a greatest common multiple, because every time you decided on a number, you could double it or multiply it by another positive integer, and have an even larger common multiple. There are an infinite number of common multiples.
The numbers could be 850 and 1700. There are other possibilities.
Those two numbers could be 18 and 36.
5 and 10 is one possibility.
A single number does not have a common factor. Common factors are factors that two or more numbers have in common. The greatest common factor of a pair of numbers over 50 could be any number, depending on the pair of numbers. The greatest common factor of 51 and 100 is 1. The greatest common factor of 51, 52, 53, 54, 55, and 56 is 1. The greatest common factor of 52 and 100 is 2. The greatest common factor of 57 and 102 is 3.
Short answer: There is not one. You could say that the greatest common multiple is infinity since there are an infinite number of common multiples. If you give a specific number as the greatest common multiple, then no matter how great it is, I can always make a greater common multiple by adding 350 to yours.