7 and 9
The LCM of 7 and 9 is 63.
Since 63 is a multiple of 9, it is automatically the LCM.
The LCM is: 63
63 = 3 x 3 x 7, so there are more than one combination: 7 & 9 and 21 & 9. That should be it, unless you want to consider the somewhat trivial combinations : 63 & 21, 63 & 9, 63 & 3, 63 & 7.
The LCM of 7 and 9 is 63.
You don't. You need at least two numbers to find an LCM.
The least common multiple is the smallest number that is multiple of two or more numbers. 21: 21, 42, 63 63: 63 The LCM of 21 and 63 is 63.
10 and 63
9 and 21
The LCM of 7 and 9 is 63.
3, 7, 9
7 and 9