This is very simple, all you have to do is get the lowest factor of one number [as long as it's not 1], and give that as one of the "given numbers."
For example, give 9 as a given number, then take a factor of it, which is 3, and give 3 as a given number. So, the given numbers are 3 and 9, and the LCM is 3.
A bit more challenging pair is 2 and 100.
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No, 2 and 10 are factors of 20. The LCM of 2 and 10 is 10.
The LCM of one number is itself. LCM involves two or more numbers.
You need at least two numbers to find an LCM.
Only if they're the same number. The LCM and GCF of 10 and 10 is 10.
You need at least two numbers to find an LCM. If that's 6, 10 and 15, the LCM is 30.