You need at least two numbers to find an LCM, which is the smallest positive integer that all the members of a given set of numbers will divide into evenly with no remainder.
The LCM of 8 and 15 is 120. If the lesser number were a factor of the greater number, the LCM would be the greater number.
The LCM of 5, 9, and 15 is 45.
The least possible number for the LCM of 15 and 105 is the same as the least possible number for all the common factors of 15 and 105 and is the LCM of 15 and 105 which just happens to be 105.
The numbers could be 7 and 15 whose LCM is 105
45
The number are coprime so their LCM is their product ie 15*23 = 345
The LCM of one number is itself, and LCM usually involves two numbers or more.
The LCM of 15 and 189 is 945 because 945 is the first number that both 15 and 189 divide evenly into.
The LCM of 9 and 15 is 45
Because 37 is a prime number it is: 37*15 = 555 which is the LCM
7
105