Infinitely many.
There are 12 multiples of 8 in 1 to 100.
10 is two in multiples of 2 to 100
200 and 300 are multiples of 100, among many others.
They are all multiples of 1.
There are 30 multiples of 30 that fall between 100 and 1,000.
101
There are ten different integral multiples of 10 that are equal or less than 100.
There are 30 multiples of 30 between 100 and 999.
20
10
There are 6 multiples of 15 in 100. They are: 15, 30, 45, 60, 75, and 90
100 of them.