200 and 300 are multiples of 100, among many others.
All nonzero numbers have an infinite amount of multiples.
Two numbers
Anything that doesn't end in at least two zeros.
There is an infinite number of common multiples for 24 and 100. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
The LCM of two consecutive numbers is their product. The LCM of two consecutive multiples of 5 is their product divided by 5. Two consecutive numbers cannot be multiples of 5.
42 and 84
All of those numbers have an infinite number of multiples.
25%
Multiples of 100.
101
All numbers have an infinite amount of multiples.
45, 54