Step-by-step explanation:
The least common multiple of 39, 45 and 54 is 3510.
39 => 3 x 13
39 => 3 x 1345 => 3 x 3 x 5
39 => 3 x 1345 => 3 x 3 x 554 => 2 x 3 x 3 x 3
39 => 3 x 1345 => 3 x 3 x 554 => 2 x 3 x 3 x 3= 3 x 3 x 13 x 5 x 2 x 3
39 => 3 x 1345 => 3 x 3 x 554 => 2 x 3 x 3 x 3= 3 x 3 x 13 x 5 x 2 x 3= 3510
39 => 3 x 1345 => 3 x 3 x 554 => 2 x 3 x 3 x 3= 3 x 3 x 13 x 5 x 2 x 3= 3510lcm (39, 45 and 54) = 3510