30 and 60 have an LCM of 60.
You need at least two numbers to find an LCM. If that's 5 and 30, the LCM is 30.
30 and 60
3 and 30
3 and 30
3 and 30
3 and 30
20 and 30
In order to have an LCM, there has to be two or more numbers. Some multiples of 30 are 60, 90, 120, etc.
Since 30 is a factor of 90, the LCM is the larger of the two numbers, ie 90.
5 and 6 have an LCM of 30. So do 10 and 3.
You can find the GCF of two numbers by dividing their product by their LCM. The LCM of 30 and 42 is 210. What is their GCF? 30 x 42 = 1260 divided by 210 = 6 The GCF of 30 and 42 is 6.