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
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The common multiples of 27 and 36 are 108, 216, 324 and so on.
1, 3 and 9 are common factors of 27, 45 and 81. 27, 45 and 81 are multiples of 1, 3 and 9.
Multiples of 3 are 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, and so on. Multiples of 5 are 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, adn so on. The common multiples of 3 and 5 are all of the multiples of 15, i.e. 15, 30, 45, 60, 75, 90, and so on.
The common multiples of 15 and 25 are all multiples of their LCM, which is 75. So, the common multiples are 75, 150, 225, 300, 375, 450, 525, 600, and so on.
The Least Common Multiple (LCM) for 8 10 15 is 120.