Multiples of 3 in that range include 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51 and just keep adding three until you get to 135. For them to be common, they need to be compared to another set of multiples.
The first 5 multiples of 135 are: 135, 270, 405, 540, and 675.
15, 30, 45, 60, 75, 90, 105, 120, 135
45, 90 and 135
The multiples of 3 up to 30 are: 3,6,9,12,15,18,21,24,27,30.The multiples of 5 up to 30 are: 5,10,15,20,25,30.The only common multiples are 15 and 30.The LCM is: 30
well the lcm is found by factoring 15 is 3 *5 27 is 3 *3 *3 so the LCM is 3*3*3*5=135 others would be multiples of that like 270,405,540 etc
21,69
15,30,45,60,75,90
9 * 5 = 45 (LCM) 45 * 2 = 90 45 * 3 = 135 45 * 4 = 180 etc.
45, 90, 135
15 and 30
21 and 42 are.
6,12,18 are the common multiples of 3 and 6