7 x 18 = 126 126 is a common multiple of 7 and 18
Any multiple of 126.
63, 126, 189 and so on.
They are 63 and 126
There are an infinite number of common multiples for 7 and nine. Some of them are 63, 126, 189, 252, 315, and 378.63
42, 84 and 126
63, 126, 189.
42, 84, 126
126, 252, 378
42, 84, 126, 168
The lowest common multiple of 7 and 9 is 63. The common multiples of 7 and 9 are therefore the infinite set of multiples of 63. Thus, the common multiples of 7 and 9 are 63, 126, 189, 252, 315, 378, 441, 504, 567, 630, 693, and so on.
The common multiples of 7, 14, and 21 are the infinite set of multiples of their least common multiple, which is 42. So the common multiplesof 7, 14, and 21 are 42, 84, 126, 168, and so on.Any multiple of 42.