They are the six multiples of 15.
They have to be multiples of 15 so all of them will be multiples of 3. They all have to be even so you are left with 30, 60, 90
The common multiples of 3 and 15 from 1 to 100 are 15, 30, 45, 60, 75, 90
The common multiples of 3 and 15 from 1 to 100 are 15, 30, 45, 60, 75, and 90.
The least common multiple of 10 and 100 is 100 because if you write down all the multiples of 10 and write down all the multiples of 100 the only number that you see that the number 10 and the number 100 have in common is 100.
15,30,45,60,75,90
60 and all its multiples
The multiples of 15 are 15, 30, 45, 60, 75 and so on. For them to be common, they need to be compared to another set of multiples.
All multiples of 90.
30 and all its multiples
3:3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99 15:15,30,45,60,75,90,105
The common multiples of 3 and 15 in the numbers 1-100: 15, 30, 45, 60, 75, 90