The term common in the question means a multiple that is shared by one or more numbers.
Since 42 is a single number, it can have no common multiples.
If you said, 42 and 2, then we could look at the multiples of 42 and the multiples of 2, make two lists, and see what is in common with those two lists.
If you list the multiples of 42 alone, you have nothing to compare it with.
The least common multiple of 42 and 25 is 1050.
The least common multiple of 42 and 126 is 126.
what is the least common multiple for 18 and 42
The least common multiple (LCM) of 2 and 42 is 42.
The Least Common Multiple of 42, 81 is: 1,134
The Least Common Multiple (LCM) of (42,14) is 42.
The Least Common Multiple of 42 and 112 is 336.
The least common multiple of 156 , 42 = 1,092
The Least Common Multiple (LCM) for 42 15 is 210.
Least Common Multiple (LCM) for 13 42 is 546
Least Common Multiple (LCM) for 42 126 is 126.
Least Common Multiple (LCM) for 36 42 is 252.