The multiples of 3 to 99 are the following:3,9,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96 and 99 1 and 100 is not a multiple of 3 so it should be from 3 to 99 :)
25, 50, 75, 100
21, 42, 63, 84
They are the first six multiples of 15.
4, 8, 12, 16, 20 and just keep adding four until you reach 100.
There are an infinite number of multiples of 100. 100, 200, 300,400, ....