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.
10 and 63
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.
9 and 21
The LCM of 7 and 9 is 63.
3, 7, 9
7 and 9